OMG I love this! I finally got to go to Sephora Friday...I picked up UPP...but then I was like, you know what, I really wanna try Too Faced SI...SO glad I did! I tried it Sunday, I used a l'oreal hip duo and milani shadows, so you can get an idea of the pigmentation. It lasted through a hectic day at work, even after when I crashed (yes, I slept with makeup on, bad me) it still stayed on, it was just some of the frost of the eyeshadow came off...understandable.
But to stay on that long: wonderful! especially with my crazy oily skin. So yes, buy it! You wont regret it. I never believed in eyeshadow primers (used to use shadesticks, paints, creme crayons...everything) but from here on out, I'm gonna make sure to have Shadow Insurance on hand.