I have been a member since 1997 and had 596 transactions. Once I did not receive my purchase and this was in the days before the protections we now have. Quality has been an issue a few times, but to me it was just a case of "buyer beware" because I made assumptions. I have received many items from China. They offer free shipping and it costs $30 to ship from US. You do the math!
I never do my feedback until I receive the package. On the whole I am happy with eBay and hope to do transactions for another 17 years.