I've never bought anything on gunbroker, but I've sold a few things.
As a seller, I love the 15 minuter rule, as it gets me the best price for an item. All of my transactions on gunbroker have gone very smoothly.
I've sold on eBay too, and I find it to mostly be a headache. The fees are high, and many buyers don't read the listings (like when I say I won't ship internationally). I had to ban a guy from Poland from bidding on my auctions because he kept winning and the cost of me shipping him 4 spark plugs was going to put me in the hole $30. I had fixed shipping on all of my auctions, and I had one guy demand a refund of the difference between actual shipping and collected shipping, lest he leave "negative feedback". I didn't think typing me the message was worth the $0.11 difference.
