I fully agree with the complaints. Reason is not far to see. Most often, as they say, if it is too good to be true, it probably is ! Transactions are painful. Products are faulty and subsequent transactions to redress adds to the pain. Risky and not worth the trouble to buy from eBay.
Having said that, my best experience was on Amazon where the customer service is excellent. But then it is also a lot less risky buying a book than, say a flash drive mp3 player as I foolishly did.
Bottom line, stay away at any rate from electronics, mobile phones, computers and the like.