I love this primer and have been using it for 4 years now. I switched from MAC's Paint Pot, which still works great but my oily lids dissolve that in 7-8 hours of wear (& I find that it's not easily blendable).
I never knew how UDPP was better until I slept in my make up one night and the next day, my eye make up was still perfect. I was certain that I would see my eye make up melted off in the mirror but it wasn't! I wish this stuff was cheaper but I have yet to find another e/s primer that makes e/s vibrant, is long wearing, is super blendable (when not dried up), and dries as quick upon application.