Verrrryyy sketchy. You buy the bids for. 60 cents a piece and then sit at your computer for possibly HOURS watching the item you want as you and other suckers keep plunking down their bids hoping vainly that you'll be the last man standing.
My biggest complaint is that on at least five occasions, I threw bid after bid at an item, only to keep getting outbid. Then, magically, as SOON as I quit bidding, some one who just joined the auction WINS! I just wasted $40-$50 in bids on something and some schmuck who just showed up wins the item because the other bidder with whom I was competing got fed up at the same time as me and walked just like I did!
They suck you in with promises of 50" plasma flat screens for $3.50. I NEVER saw something that nice go for under about $75, but you have to spend probably $200 in bids and winning is PURE LUCK! You can easily spend 3-4 hours and $200 and come away with nothing.