I'll tell you this...I do not trust any auction management service with inventory, especially the big ones, like Marketworks. In a multi user environment, anyone can edit the available number, say, to relist something before the UPI is closed, then the item automatically relists, and there you are selling something you don't have. No way to know who edited, what the original # was, etc. Maybe Auctiva can do better, but the big boys sure can't. I recommend QuickBooks if accuracy is important to you.