I had the Oil Slick (black) in a split new face case break on me the day I bought it and ruin the rest of the case by covering everything in black triple-pigmented dust. I managed to clean off the other 3 e/s a bit, but the glosses and bronzer gel were basically a write off, and there was nothing whatsoever left of Oil Slick (other than black icky stuff all over the other products).
I decided it wasn't the shadow's fault, given the events of the day I'd bought the facecase (the train I'd been on was in a very "near miss" situation with another train(!), I and the other passengers were all thrown a couple of feet across the carriage as our train screeched it's brakes on and gave us an almighty jolt.) I shrugged, reckoned that it was just bad luck, that sure I could probably claim against the railway but it wasn't worth the effort (I'd broke an eyeshadow, not a limb) so just bought another facecase.
This time Oil Slick *and* Hotpants shattered within a week. No near rail disasters to excuse it this time or anything. I do have a coupla Urban Decay e/s still, and I do risk putting them in my palettes, but I would be reluctant to house a dark UD shadow in the same container with my beloved MAC e/s ... just in case it broke.