I call the model 6934FDWDE Makita cordless impact driver the Love Tool, because it makes tedious jobs quick, easy and almost fun. The 3.8-pound Makita is roughly the size of a compact cordless drill, but it delivers 1240 inch-pounds, or 103 foot-pounds, of torque at up to 3000 impacts per minute. The trigger allows variable speeds and amounts of power, and a button easily reverses the drive. A built-in LED light illuminates the work area. The tool comes with a charger and a second battery. I go weeks or months of sporadic use without charging the battery.This is for taking things apart as there is no torque setting, though the manual does give you a guideline for how many seconds you should hold the trigger for different-sized bolts.
This is a powerful tool, and for tearing down an engine or changing out a clutch, it is magical. After a long day of wrenching, my wrists are less tired and sore if I use the Makita whenever possible. At $480, it is much more expensive than an air-powered tool or even a corded electric impact wrench but much more convenient.