The model XDT09 has three speeds and automatically downshifts to prevent fasteners from stripping or breaking. That's a big plus for someone who's used to working with a single-speed impact driver for everything from big lags to small screws. It's easy to damage the work surface or destroy the fastener in a moment of inattention. In Makita's Quick-Shift Mode, an electronic controller detects the amount of torque the tool is applying and automatically downshifts just before the fastener is driven home. Other features include an 18-volt brushless motor, an LED light, a three-stage battery gauge, and a short head that fits in tight spaces. The kit retails for $369; the bare tool is $169. Read More