This is the first primer that I feel works on doing a what a primer should: smooth out skin before foundation application.
Generally I am quite skeptical about primers, I think that they are an additional expense to an already expensive and time consuming regime of cleansing, toning, moisturizing and foundation application. I have tried a heap of primers (I’m a cosmetics junkie!) the napoleon perdis, smashbox etc. However, this is the first one that made my foundation (diorskin sculpt) go on even smoother and I think increase it’s lasting power.
Some people here have complained about the strong, flowery scent of it…Personally, I love it! And upon application, it gives my skin a tingly, sensation which is nice. I do not like the applicator, as it is unhygienic for continual use, so I collect the product from the applicator onto my fingers and spread it onto my face (with clean hands after moisturizing face first!). I wait about 4 minutes and apply my foundation.
I probably won’t repurchase just because it is so expensive, and it does not make a significant “wow supermodel skin” difference for me. It does enhance the skins appearance and if I had all the money in the world I would keep repurchasing, however I’d rather buy a really good foundation like Dior than buy a cheap foundation and this, if you know what I mean.

It does a great job under the Kett Hydro and OCC airbrush makeup. I do think the price is prohibitive in me purchasing the product again. I think the smell is very flowery and strong and has been a turn off for some of my clients. Also, I do agree with other reviewers on the brush applicator, it's not very sanitary… and it gets "clogged" often. Wish it came in a squeeze tube or something like that.

There are two types of this primer one for dry skin and one for oily skin. I bought the one for oily skin and it does keep you matte for upto 5 hours. This product is okay. I've seen better. To be honest I wouldn't buy it again but it was worth the purchase as I am using it.

This is a great primer for my dry skin at least, perfect surface for foundation. I do agree that the brush is a bit unhygienic - I dont really understand the purpose of it. But then again, I usually apply skin products with fingers anyway.

I was really disappointed with this product mostly because it was so expensive! This didn't agree with my rosacea, I didn't like the smell and I think the brush applicator is unhygienic.

I find YSL very hit and miss - I hated everything about their mascara for example, but am pretty keen on their foundation. This primer I do like - it's silky to the touch, smells wicked (even though I know some people can't stand it) and has a nice, fresh, tingly feeling on your skin. My skin is strange, when I wear no make up it's completely matte but the occasional product will make it very greasy. With this product I have no grease at the end of the day (I wear it with YSL perfect touch foundation, not generally ever on its own as I don't see the point as it's made to prime).
What I don't like about it is the built in brush that comes with it - I just find it unhygienic. I've had the product about 2 months now and the primer that cannot avoid being left on the brush dries out and goes crusty on the brush, ew :( I'm sure there's a way you can take the brush off, I just haven't got round to it because I only wear primer and foundation if I'm dressing up to go out etc. It's not the CHEAPEST thing you'll ever buy, I think I got it for about £25 in House of Fraser, but then again you're paying for the brand name.
Overall I do like this product and it does what it's supposed to :)

I wanted to love this but Im very dissapointed. It just doesnt seem to do anything for me. It makes my face feel velvety to the touch but it also feels thick and strangely suffocating on my skin. It doesnt improve the application, appearance or longevity of my foundation and I think it dries my skin out.

I tried this after finding it in an online store heavily discounted due to having no box and decided to try it. I was pleasantly suprised! My skin feels like velvet after I've put it on and it does keep my makeup fresh for much longer. I've also noticed that I get far less oil coming through as the day wears on - I suspect the silicone is plugging up my pores preventing the oil from breaking through so I dont use it very often for fear of a breakout, I save it for special occasions. My pores definitely are less noticeable when I use this. I dislike the brush and that you can't see how much of the product you have left. I also find I have to work a lot harder at blending my foundation and I'm not sure I would buy again if I had to pay full price, but if I could get it at a discount, yes.

I wear this alone over my sunscreen and my skin looks poreless and stays matte throughout the day. I have not tried layering foundation on top of this so I am not sure if it rubs off like other reviewers here noted. But when used alone, I find it a great alternative to tinted moisturizers and BB cream. You have to wait a bit for the product to work. After you put it on, you will feel a tingling, cooling feeling. Once that is settled, your skin will look "made up".
I have yet to try the brush though because it seems so unhygienic. I only squeeze the product onto my fingers and rub it on my face directly.

ugh ugh ugh. i HATED this product. and i am a YSL fan in general. always re-buy their mascara and love teint parfait. this however was vile. i was pushed into it by the SA at selfridges (unusual for me because i never get pushed into stuff; are YSL salespeople the pushiest ever or something??) In a word, it is horrible. had no brightening effect apart from a weird glittery finish that i happen to hate. and worst of all, after only 1 use it broke me out in big lumpy spots. i hate it and will never repurchase. money down the drain. if you like glowy/shimmery products that are somewhere between skincare and makeup, try clarins beauty flash. i also love love love guerlain meteorites liquid/gel and nars orgasm in the tube. ANYTHING but this ysl disaster!!!

I bought this product quite while ago, the SA pretty much talked me into buying it. I did not experience any of the wonders promised by its rather clever marketing: no particularly visible glow or radiance. It does make the foundation application easier; however my skin is rather sensitive, and the tingling sensation that comes immediately after its application is not a nice thing at all. In addition to that the areas on my cheeks that are prone to redness become even redder. If I use this product, by the late mid-day the foundation goes flaky and literally can be rubbed off the sides of the face with almost no effort which never happens if the same foundation is used on its own (I used YSL and Lancome Teint Miracle foundations - the effect is the same). I seriously tired to give this thing the second (and even few more) chance(s) but the effect was the same every time. So now it just lies around - an absolute waste of money. A total disappointment.

This primer is my favourite, but by all means, nowhere near perfect. I gave up my hunt for the perfect primer a long time ago and settled for this. Most primers aggravate my acne, make me more oily, or do nothing at all. This primer has been the least offensive to me according to those three points. Naturally I'm quite oily along the t-zone, but with this primer I pretty much slather it everywhere and yet no part of my face gets unbalanced or oilier in anyway. In fact I'm sure it has helped in controlling my oilies, which is strange because it doesn't claim to and I didn't expect it to since it's so moisturising and isn't oil-free. So if you're oily-skinned, don't turn away from this primer straight away, try and get a sample if you can, because seeing the other reviews I think this is one of those love it or hate it primers based on the individual's skin. For me, this works in harmony with my skin.

I must note that I don't use this on a regular basis. My skin is quite hostile to anything I put on it, so I've adopted the less-is-more approach and reserve this for special occasions. I wore it on Monday night for the first time in months, and I observed my skin the following days for even the smallest break-out, but none appeared which I'm relieved about. However because of the large amount of silicones and oils in this, I'd definitely not risk using it regularly if you're acne-prone like me.

The consistency of this is strange. It's definitely quite thick and almost buttery, it's like a whipped balm, and when you apply it to the skin you can really feel it on the skin as it starts to tingle (the menthol perhaps?). However I don't find it "heavy" or "suffocating", like I did with the MAC prep + prime SPF50. So a buttery primer that's lightweight? An oxymoron lol. But that's how it is. After a few minutes you no longer really feel it sitting on the skin, it sort of melts in, and your skin has the smoothest texture, like velvet (I'm guessing it's the cones!).

I use this in conjunction with NARS sheer glow, MAC studio fix powder, and recently Boots No7 Beautifully Matte, and it has worked exceptionally well - particularly with liquid foundations. As I'm oily-ish, NARS SG can promote the shine on my T-zone, but surprisingly, this plus the Flash Radiance didn't make me oily at all. It's sooo strange. My skin felt so glowy on monday, and I'm guessing it's the combination of NARS and Flash Radiance - if you happen to own both in the midst of your stash somewhere, give it a try, I hope it's not my imagination and others see what I see! I like this primer because it sits comfortably on my skin, it feels kind of healthy even though I know it isn't really, it complements my makeup.

It's no miracle worker, but it does help my foundation look closer to perfect, last longer and slightly more glowy. It's heavily fragranced and can irritate those with sensitive skin, so be wary of that. I don't use the brush applicator it comes with it just seems so gimmicky, I like to rub it in my fingers and sort of massage it in like a cream. I have stuck to this for a long time as doesn't upset my skin, and does at least part of the job a primer is supposed to do - I cant say the same for others I've tried which all broke me out or made foundation slip off. The silicone texture of this is not slippery at all, it's like velvet and it has a somewhat sticky texture at first which I think helps grab the foundation. The end result is perfectly smooth - not slippery. It's pricey and the packaging sucks, but it works for me, so I'd repurchase.

GREAT primer. Better than Smashbox, Modelco and others I've tried. Don't overload the brush and don't use loads or you may get spots. You can smooth it out with your fingers if you want. But makeup stays on brilliantly and it really does give a beautiful radiance to the face. There's menthol in it so you shouldn't use too much under the eyes or it can be drying I think. I love it!

I have always had a problem with my makeup staying put. But with this I am amazed that I don´t need a touch up the whole day. It also seems to even out my skintone.

I would've given this three, but the high price tag made it lose one lippie. This did little for me. Seems an unremarkable primer and I was very aware of it on my skin. Not itchy exactly, but...there. Also, it's a little tricky to control the product being dispensed out of the brush. Not that I care though as this was a miss.

This stuff works. Downside: hated the brush!

I'm sure this product is for everyone (i have combo-skin, dry spots). And I must say this primer isss amazing! I've tried smashbox primers, laura mercier, etc etc etc and this product by far make my skin feel great and my makeup even better!

This was the first primer I ever purchased as I fell in love with it after trying a tester I received. It really makes my make-up stay put and fresh the entire day! I have an oily T-Zone but I only needed to blot it away once during the day while I was using this. As soon as I apply it it leaves a tingling sensation on my skin, which I quite like, it feels comfortable and at least it tells me the primer is doing something! On the packaging it recommends allowing it set for 2 minutes and it really does make a BIG difference. My face becomes so smooth after application and I just can't stop touching my face! Not recommended for using it around the eye area. I'm not a big fan of the brush applicator it comes with, I prefer using my hands to apply it like I'm sculpting the perfect canvas. Sometimes when I press the tube for the product it splurts out so I tend to be more careful. It certainly gives my face a subtle glow and makes it more awake. However, I think it might not be suitable for people with really oily skin as it's consistency is quite greasy.

This product really didn't do anything for the look of my skin, despite watching the how-to video on the YSL website carefully. Product dispenses unevenly through the brush and is a bit messy. The breathless prose used to describe the product in the packaging insert is almost worth the price though. LOL

Great design integrated brush makes applying easy *Feels lovely when applied tingly in a good way does not make your skin feel tight *Smooths and evens out your complexion and makes it look all dewy and glowing *Fantastic base for foundation I just LOVE IT!!