I just started doing this a couple of months ago, and my very first transaction was with a TradeKey Silver Member. I had many email discussions with the supplier and then with a rep from TradeKey before I made the test purchase. I was assured by TradeKey that all Silver members are authenticated and I would not have any problems, but in the rare case I did they would investigate.
I ordered 1 iPod Nano and 1 XBOX 360 and they were supposed to ship the next day. A week later I hadn't gotten a tracking number so I started emailing the supplier but never got a response. I then emailed the TradeKey fraud department and copied the supplier and the same day got a response from the supplier. He said it was 'difficult to ship these products out of China now' but he was going to do it that same day. Later that day he sent the EMS tracking number and a week later I got my package. Only problem is that he sent 1 pair of fugly Air Jordans and 1 Lacoste polo.
I have emailed him and the TradeKey fraud department at least a dozen times since but neither responds. I was brand new to this and used Western Union, so I have no chance of recovering my funds. TradeKey won't respond either and I've since read similar complaints about Alibaba and other such sites. None of them authenticate anything, they just collect the money from the supplier and give them the title.
I have since refused to do business with anyone who will not accept credit card payments or PayPal. This has seriously limited me, as I have not been able to find any reliable source for iPods yet. I have had three transactions fall through and all three were refunded, but if these had been T/T or WU transactions I could possibly be out tens of thousands of dollars.