I been doing Sheetrock for years and I wouldn't trade these screwgun for anything, I have used several if not all of the screwguns available and nothing works as good and is riliable like this screwgun. I work 11 to 12 hours a day and these screwgun last about 4 months of heavy and I mean heavy duty use.most screwguns only last about 1 month at most in my hands, and even if the screwgun stops working just replace the carbon brushes and you got a brand new screwgun once again.