At first I really liked this product as I found it easy to apply but the more I've used it the more frustrated I've become. After a few hours of wearing it the liner leaves smudge marks in the eyelid crease. If you do what I do and wear it underneath the bottom lashes as well, I can only say don't with this product as after a while it can look like you have black eyes!
I definitely think this is one of the cases where you don't get quality for money.

I am so glad that I am not the only one to be find this product to be lacking the qualities I look for in a liquid eye liner. Although the liner has a dense shade of black, it is just too watery for my liking.

Although the fact that the liquid is well contained and only comes out when the user twists the body of it, when it does come out, there is quite a lot of it. I find it mediocre and it was not cheap.

DON'T BUY THIS PRODUCT -unless you have money to waste! In Australia this costs a whopping $65!!! I thought I was lucky finding it at a sale price of $33. Boy was I disappointed. I have oily lids & live in a very hot climate. This sour lemon moved, slipped & ran within 10 minutes!! I bought this in brown. As other reviewers have said, the pigment is terrible, I had to reapply many times just to get a full colour. The mechanism to this pen is absolutely dreadful. I only bought on staff recommendation & she raved this to be water-resistant, smudgeproof, budgeproof, fine for very oily lids & sweat-proof, they refused return too. JUNK! NEVER AGAIN! Shame on you Dior!

Love this liner! I always used Loreal eye liquid eye liner just because this was way too expensive. But I bought it about 2 months ago and I love it! no smudges, and it stay the whole day!

Eyeliner would rub off in chunks. Did not stay on very long.

Stila liquid eyeliner is much much better.

Easy to wash off, no smudging, stays on at least 6-8 hours and beautiful elegant packaging. On the other hand, the product comes out too much or too little and takes a lot of twisting and shaking (quite frustrating really...). Then, there's the brush which is quite good at first but after a while when the product starts to dry on it it splits and becomes clumpy. Plus it's expensive and just frustrating to use.

I am a Dior fan, but not a fan of this product. It is expensive, either give too much or too litle ink. The color is good. Once applied, it does last all day. But the brush is not very good, it require a little learning curve to mast the technique. After a while, my brush head split up, it becomes messy. I am dissappointed with this purchase.

Well it was okay, at best.

The line appeared watery sometimes, and the liquid didn't come out. It either gave too much or too little. The brush was alright though, really have no comment against it.

This is good for every day wear - it does not come off! Even in rainy weather. However, given the price tag it comes with, I will not be purchasing another.

Definitely not for drama, but great product for daytime use. It wears well without smudging, lasts through a nap and is easy to remove while washing my face. It has a lighter line, which works for me well during a work day, but I'd want a more defined, black line for night. I haven't had issues with the applicator, but it may be because I don't push a lot of product through each use.I find the brush a perfect shape and flexibility for easy application. I love Wet n Wild H20 Proof, but the black one gives too dramatic a line for daytime. If you like that look, give it a try. Its under $7, which is a steal. UPDATE:Yikes, I'm downgrading this product! Sure, no smudging, but I happened to have watery eyes, then rubbed them. It completely came off! It cleanly wiped off, no residue even. Very strange and definitely not worth the price. It doesn't run or give you raccoon eyes, but it may disappear! Tried Lancomes Artliner and its what this should be. Much better lasting power!

Everyone is familiar with dial-up products so that aspect was pretty obvious; twist the bottom to increase flow of product. But I didn't find the miniscule directions in the box very helpful when it came to putting the pen itself together for use for the first time, because when you first open it, the applicator brush is not visible. At first I thought mine was broken or missing that piece.
When nothing magical happened after removing the safety ring -- dial still seemed locked and brush was still missing -- I wondered if the brush wasn't a seperate piece that had gotten stuck in the cap. Hoping to dislodge it, I then replaced and removed cap and Voila! All of a sudden the built-in brush popped out from the stem containing the liquid.
I don't see why they couldn't just say in the long-winded, irrelevant directions, quite simply:
1. Pull ring
2. Replace and remove cap
Thankfully you only have to do this that first initial time, as once you have activated the release of the brush it stays put and the whole pen design from brush to dial is GENIUS. I normally do not like eyeliner on me because I can never get a thin enough line to look natural. I would like to enhance my light eyes, but at the same time I don't want it to look like I've drawn a ring around them.
The last Calvin Klein pen I had, more like a fine-tipped magic marker, was "okay" (as in better than pencil), but I mainly only was buying again because that sucker lasted forever and I figured was as good as it could get. I'm so glad Sephora stopped carrying it so I could try Dior Liquid!! I was skeptical about the brush at first, as the brush that so many of the jar-style liquids I had tried in the past always seemed to distort the shape of either one eye or the other with the big bold incorrectable lines they produced -- a problem Dior has solved not just in the ingenius pen design, but even the tapered brush itself.
BEST EYELINER EVER. The user has total control in how thick or thin to apply the product, as well as how much or little of product itself they want to apply. And this pen brush gets ALLLL the way into the lash line becoming completely invisible if you want!! You just look like you have more defined features, not more defined caked-up make-up on your face. It is AWESOME. And the effect you get when combining this product with DiorShow Mascara is outstanding. These products were clearly designed to enhance each other. I hope they never change!