As a matter of coincidence I saw an ad for this a few hours ago and did a bit of reading up on it. My conclusion is that there aren't deals to be had.
The idea is that goods appear to sell for significantly below their retail value. However, people are charged a fee for each bid placed (typically 50p for each bid, bought in advance as credits), and every bid increases the time limit of the auction by 10 seconds.
There is an automatic bidding service provided by the website called "BidButler" that acts in a similar manner to a conventional auction sniping tool. As an auction nears closing, someone using the BidButler service on an auction has bids made for them, again being charged for each bid. If more than one person is using the service, the system will automatically battle it out until all but one person runs out of bidding credits. At the same time, every single bid will add 10 seconds to the auction time limit. The effect could be to extend the auction by 10-20 minutes, in which time people will continue making manual bids and those who had used the BidButler will be out of pocket for all the bids made.
It can be an incredibly lucrative business model for the company. Each auction usually receives hundreds or thousands of bids, each one costing 50p. However, all but the winning bidder will be out of pocket for their bids. In many cases the cost of bidding required to win an auction will make the overall cost close to retail price anyway...
Edit: Joshua Stein wrote an interesting couple of articles (first of which is
available here) about attempting to "game" the system by analysing AJAX information about bids. He monitored auctions for MacBooks and saw little success.
In case you're wondering where the incentive is for the company, he provides an interesting example: a MacBook Pro valued at $1,299 was sold for $172.84. 17,824 bids were placed, bringing in $12,963 for the company in addition to the final winning fee... for a $1,299 laptop.