AuctionCut

I am thinking about using an online service for automated listing and inventory control. From all the companies out there, so far I narrow it down to two choices. The first one is solidcommerce.comand the second one is channeladvisor.com. Just from checking both sites and after couple of phone calls it seems like both companies offering very similar services, I guess the main different that I found so far was that solidcommerce.com doesn’t charge % of your sales and less expansive to start. Also they got automated shipping software which I like. Does anybody know more about any of these companies and maybe can share their experience?