I had been doing hand filing for rebalances for a year and broke down and bought a drill. I was TERRRIFIED of the thing at first, but now that I am getting the hang of it it cuts 1/2 hour off my fills for rebalances. I have been using a 2 week carbide bit and just got my flying saucer bit and cant wait to try it. I heard they are quicker yet. I dont use my drill for anything else other than the free edge and under the nail. I want to take a class before I do that. The only thing I wish I had done, was get asmaller handpeice. Mine is a Medicool protouch, which is inexpensive but works awesome. Just a little hard on my little hands when I work with it for a long period of time.