No experience with the player, but I would be REALLY careful buying a player off of eBay. Many players on eBay are hacked and the fact that they just started selling them doesn't look good. If you must buy one off of eBay, check the feedback and find out if they are getting good ratings on PLAYERS. Most scammers start off selling legitimate items like cases and flashlights, etc. Then when their feedback is good, switch to hacked players. If they just started sellling MP4 players, I would stay away from buying their items.
Check out UXcell
. It is a respected website that has a forum on this board.