You can get Really good deals on things if the timing is righ, but research the lots before they come up for bid. A lot of the jewelry they sell is found for a fraction of the price on Amazon.
For example: there is a peacock necklace I keep seeing come up for auction, with $5 shipping and bids start at $1. If you even bid on it, you have already spent $3 more than what it costs on Amazon.com.
My advice is to do your research and bid with caution.