Here's my experience so far with Ubid. I saw these units and took a swing at getting one. Placed a bid with a max of $199 on an auction ending at around 2:30am or so. Went to be, got up and checked, it was listed as a losing bid on the "My Bids Page" or whatever they call it. Winning bid range was $209 - $219. I have an email with a "sorry you missed out but here's a link to another of the same type of item" message on it. So I follow the link and make a bid, $209 max this time. This was all on last Friday morning. The second auction was to end that afternoon sometime. I get home from work and check up on it and discover that I'm now the proud owner of... TWO of these things. Why? Because in the fine print somewhere they say they reserve the right to reinstate losing bids if some of the winners are disqualified for some reason. I send an email to them basically saying "umm, I don't think so". I had no reply by Monday morning so I cancel my credit card which has not been charged for either of them yet. (Thank goodness). It is now 6 days after the initial bid and there's still absolutely no word from them at all, either about my email on the double win, or about my credit card not being valid. You'd think they'd at least be trying to get payment by now.
So, all in all... what a shady way to do business.