compared to other primers I've used, I always prefer UDPP. Even when my eyes are feeling extra dry and i use a heavy moisturizer under my makeup, this primer potion keeps my eyeshadow from creasing-its amazing.
the sample sizes come with almost every purchase and they last forever! I have given away a few sample sizes, and I still have 3 of them, plus a full size bottle that I haven't even opened yet. I'm stocked up for a long time!