we ordered quite a lot of stuff from ubid. 2 AV receiver was DOA (one was 1700) and they took it back without hesitation, even paid for the return shipping (it was like 70 pounds :Q)
the only bad experience we had was a refurbished phone, the cosmetic condition wasn't very good but it works.
I don't think UBID scams, it's YOUR responsibility to check out the shipping charges BEFORE you bid and you take your risks by ordering from a 3rd party (which i never did). They didn't send me a DOA XP cpu. Most of you are just exaggerating. Customer service would be average IMO.