you are prolly going to save 500 dollars. Its not worth it, unless you are buying an old laptop or something. When you bid on their item, you will get spam......spam.....more spam.
I bid on a sony vaio a190, he was selling it for 1700. It cost almost 3 gs--scam. Some guy won but got ripped off. anyway after awhile my email box filled up with spam.
stuff like,
test drive a vaio
cheap laptops
then personal emails saying buy from me but don't tell ebay.
Ebay I have found to be good for NoN-Expensive items.