I haven't heard any real negative things about the Drill Doctor product, and I've heard quite a few people say they like them a lot. Are there any vendors on this site that sell them? I'm looking at either the 500 or 750 model, and prefer to have my money to go with a site-supporting vendor than some Googled mail-order shop. PM me or just respond to this thread.... Feedback on the Drill Doctor (pros / cons) would be good too.