I had register for a bid and they hold $2,500 deposit for over a week after the action ended and the Seller never accept the highest bid(not mine). I had to call them many times to see my money back.
They did not let me see the property (even holding a Real Estate Broker license), so does not make any sense to me, besides that they told me we are responsible for all unpaid taxes and any lien the property has...
I stopped looking their site and I think they are not serious... so be careful, because you can loose a lot of money with this auction.com scam company.