I've had the brushless DeWalt for a few weeks now. So far, I couldn't be more pleased with it.
The 3 speeds are great, most of the time its' left on "2", plenty of power for general shop use. The "1" setting takes the power level down close to the small 12v impacts for light work. Kick it up to "3" for big stuff.
Battery life is proving to be excellent as well, the battery is still full, its going to be hard to remember where the charger is.
Ed