I bought several express cruisers from them to use/re-sell in the last few years. Seemed like OK guys, but they ARE boat brokers. Just make sure you get a survey and a mechanic to look at the engines. Even they don't necessarily know what they have since it's repo'ed.
You'll have to pay about $10.00 to become a registered bidder and they "close" all bids on vessels every Monday afternoon. Banks yea/nay the high bidder in the next 1-3 days after that.