Just for the record, this was recommended to me by numerous gals and is the first eyeshadow primer I've ever tried.
That being said, I'll never NOT use a primer again! Love it! I was worried about the pinky tint (I have yellow undertones), but it blended over my eyelids effortlessly. When applied to my lower lashline, everything - eyeliner on the waterline, eyeshadow, foundation, concealer, whatever I do that day - stays exactly where it should. I also use it to prime a tiny red scar in my undereye area from a healing zit. I paid $28 CAD, which was steep for me, but I'm okay with it now after using it and realizing that this teeny bottle will last me a long time. I only use a pinhead size for each eye area.
Without primer I loose every speck of eyeshadow into my crease. What I realized while testing/playing with this product is that I had very minor creasing ONLY with my cheapest eyeshadows. When I used better quality eyeshadows (especially Revlon Matte shadows though not high-end), the shadow blended beautifully, had zero creasing and looked fresh right up until I washed it off before bed.
I will repurchase! :) How did I ever wear eyeshadow without primer before??!?