Tools of the Trade magazine rounded up EIGHTEEN 18-volt lithium-ion cordless impact drivers, and gave them to a contractor to test them out. Then they published the results in their Fall 2011 issue.
Makita 18V LXT Lithium-Ion Brushless Motor 3-Speed Impact Driver (LXDT01).
In the end, the Makita 18V LXT Brushless Motor Cordless 3-Speed Impact Driver (LXDT01) came out on top as their "Overall Favorite."
The reviewer liked the LXDT01's combination of power, run time, compact size, and ergonomics. He also noted that the cordless motor is smaller, more efficient, and more durable because there are no brushes or commutator to wear out.
Makita 18V LXT Brushless Motor Technology delivers up to 50% longer run time, increased power and speed, and longer tool life. For more on the LXDT01, go here.