I have never purchased anything yet, but I just started selling on that site. I have heard good things about liquidation.com and decided it would be a great place to supplement my sales. I carry several thousand items and it is a great place to sell my items that I have too many of. Right now I have too much money tied up in inventory and I need to have more ways to go through my supply quicker.
Liquidation.com also keeps tabs on how your items are selling and will put that information for everyone to see in the listings, to make sure you are a trusted seller.
I think it is a great platform for buying and selling inventory.