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If you are installing metal building siding or roofing and you are using cordless drivers, you will quickly discover that they are incapable of providing the necessary torque. All day, every day, this Milwaukee will drive those self-drilling screws with the amount of torque you require. You can feel the tool attempt to spin in your hand even when you are not pressing the trigger. There are extension cords required, of course, but the power and long run time make it worthwhile to lug a cord around the job site, in my opinion. In addition, I recommend purchasing a set of magnetic hex shank drivers to help keep the fastners in place when working on vertical surfaces.
