Excellent site for checking and ebay users feedback. I have used it quite alot to check if sellers are legit or not. Handy tool for buyers and sellers on ebay, and very easy to use.

Approximate cost: $FREE

I use this if I really want to check a seller's history on ebay. Much easier to use than sifting through pages of feedback on ebay. It shows all the negative/neutral feedback for a user on ebay plus it has a couple of other handy little tools. A must if you want to do some homework on a seller before buying a large item.