Bought my Xoom with the Motorola Display Portfolio case on the 4th of March. I have babied this thing. I am only developing apps with it, I do not carry it around. Heck, I even left the original screen protector in place until my Zagg shipment arrives. Check out the scratches from the Morotola case in the link below (please look at both pictures, and definitely use the zoom - the first is a slight scratch that is hard to see).
I took the case and Xoom by the Verizon store today. They refunded my case purchase, but would not do anything about the Xoom itself. They said it was cosmetic damage and that there was nothing they could do unless Motorola issued some sort of statement about problems with the case. The Verizon employees (sales rep, and the store manager) even agreed that the damage was caused by the case.
Whiskey Tango Foxtrot!?
Case Damage Pics