I have been devoted to my NYX Jumbo Eye Pencil in Milk for about 2 years now. Its the perfect base to make any eyeshadow vibrant. even though the JEP isn't the best primer, its still somewhat decent if used alone- but I still apply it over MAC's Painterly Paint Pot to ensure no creasing. I have a few set Holy Grail's from NYX, and recently made an order to purchase some favorite products. I wanted to try something new, and this seemed like a little more easier to use the then Milk JEP (it slightly does tug the skin around the eye, but nothing bothersome) ....Anywho, upon first usage, I noticed that it was far more creamier and easier to apply then the Milk JEP & I've been loving this ever since! it works with all my eyeshadows, and I never have any creasing. I am so happy I purchased this :) try it out, its really great. I still apply it over Painterly just to be sure- but even alone, its a fab product, and the packaging is cute to :P

Update-

For some reason, this primer no longer works for me :( it creases my eyeshadows horribly. I'm confused because it worked so well at first. I think the culprit might be my MAC painterly paint pot, so I'm going to test this over Urban Decay's Primer Potion, and see what happens. I'm hoping it will work well in conjunction- because this will make the crappiest qulaity of eyeshadow look so vibrant.

I became curious about NYX' White Eyeshadow Base after seeing gurus like Queen of Blending use it, and it seemed like a better better alternative to NYX' Milk Jumbo Eyeshadow Pencil, which has never really appealed to me. I picked this up from Ulta for $6.99 and tried it right away at home. It makes colors appear much brighter and is a good, semi-sticky base for glittery shadows, pigments, and shadows with a fallout issue.
I apply this base by patting it on with my finger over a primer. If used with primer, I have no problem with creasing. Like the Milk Jumbo Eyeshadow Pencil, the key to preventing creasing is to apply this product in a very thin layer. May I add this helps eyeshadows blend like a dream.
Another pro for this product is the packaging. It comes in a cute clear acrylic jar with a white lid. You get a lot of product (7 grams), which seems like it'll last forever. I've had this since April and use it very often and have barely made a dent in it.
While I don't feel like it makes shadows 100% more vivid like it claims, It does make them noticeably brighter. Like most NYX products, the value and quality of this product is great.

I used this product for the first time today. It definitely did its job of making eyeshadow pop. I used a primer underneath the base and it did not crease even after I did my work out.

It cannot be emphasized enough that this is a base not a primer, with a primer underneath of this it does what its supposed to and that is to make colors Pop and appear brighter and appear more true to pan color on the eyes.. Highly recommended.

I've been using UDPP for a while now. While I like how it prevents make e/s from creasing and makes them brighter, it feels sticky. It's always been a turn-off for me. So I read the reviews and got this one, seeing that this was rated higher than Pearl White. It creases so I have to put it on(w/a dense brush) right before I put on my e/s. I have UPM 'Oro' and it's true glod with the base underneath. A keeper :)

so i bought this at imats where i got it for half the price and i really wasnt that impressed , it creases way too much and doesnt really add to color as i thought it would, i just only like the way it stays on all day but the creasing gotta go!!! so i dont think i would re purchase this item anytime soon i would rather spend money on a paint pot from mac and i didnt really care for those either.

I just got this, and put it to some rigorous testing today--work, errands, even a massage (My face was pressed into a face cradle!) Ten hours later, and my shadow hasn't budged. Seriously impressive.

On my lids, no single shadow base has ever done the trick. I layer this over the NYX HD eyeshadow base. (I used to do the same thing with UDPP and a MAC paint pot before I found these absolute gems.)

This combo of products is amazing and I am completely thrilled with the price.

This stuff is wonderful. I have fairly dark skin on my eyelids, and some of the soft yellows, bright greens and light blues that I own don't really show up the way I imagine they would. This base completely transforms the eyeshadows and makes them look fantastically intense. I dab it on lightly, so I haven't noticed creasing. I put some on one evening to go out and 24 hours later it still lingered. Highly recommended.

I really like this base. I will say that you should still use a primer for crease protection. I use this white base basically to make eyeshadow colors more vibrant, and for a stickier base. (Not for longevity) It works brilliantly for that.

I use a thin layer of this white base under my shadows & it does make the color more vibrant. I don't have any problem with this creasing. Another great product from Nyx.