I just got my Benefit Erase Paste and tried it out. I'm sick today, so my under-eye circles seem to be a bit worse than usual, which the camera doesn't show as much thanks to my flash, but here's photos anyway.

BeforeBefore

AfterAfter

It seems to work better than my MAC, Boots, Smashbox and Vincent Longo concealers, is very easy to blend but doesn't cover up the dark circles perfectly. I give it 4 stars.