I bought a dvd player off there awhile ago, with no problems. No where near the volume that Ebay has, but not a bad site to bookmark if they carry something you are looking into buying. Watch out for unreasonable shipping charges on some of the auctions.
Bought various electronics from them a few years ago without a problem and wouldn't hesitate to buy again if they had the right price. Be sure to check pricegrabber.com or some of the other sites because some of the ubid prices can get out of hand.