Ebay tool that automatically places a higher bid

I hope everyone knows about Ebay, auction website. Once the ebay booms up in the market our software professionals comesout with softwares related to Ebay. One such tool that automatically places a higher bid when you are away from the computer. These tools for eBay that automatically posts a higher bid when you get outbid and if you are away from your computer and want to make sure you win the auction per say.

Some are:

eSnipe - http://www.esnipe.com/
Auction Sniper - http://www.auctionsniper.com/
Bidnapper - http://www.bidnapper.com/
Powersnipe - http://www.powersnipe.com/
BayGenie- http://www.baygenie.com/