I have been trading on eBay for many years and unfortunately have not found any other site that allows me to sell antique and vintage products globally so effectively.
I joined eBid a few years ago in the hope it would shortly be the competitor of eBay, sadly that has not come to fruition. I do not list on eBid at the moment because the minimum I require to help sales is a 'Best Offer' option. Although there have been many requests for this, eBid are taking their time in delivering it.
I am hoping in the future eBid will become more aggressive and pro-active in the market, I look forward to giving eBay the finger :-)