I have sold somethings, but mostly bought.
I used to sell a lot on the site, but then they came of with this lame 5 star rating system, and if you get a 4 (good service) star average you can't sell. IT is really stupid, since a 3 star rating is satisfactory. The buyer doesn't know that anything less the 5 stars is bad for the seller.
From a buying stand point, I have been very satisfied 98% of the time, and like the buying experience on eBay.