Summary: The first project I used this monster on was a valve job on a Cleveland 351. Seams like a thousand bolts involved but the repetitive, long-winded bolts (intake and heads) can be a drag with a ratchet or even a corded electric or pneumatic impact wrench. But with baby it's quick and easy to get 'em all with no fatigue. For headers, spark plugs and bolts/nuts in tight places you'll need a pneumatic impact ratchet but for everything else this thing ROCKS!
Pros: Easy Control, Ergonomic Design, Fast Working, Good Grip, Lightweight, Powerful Torque, Quick Chuck Change
Summary: Although I don't work on as many cars as I used to, this lightweight 3/8" drive impact makes quick work of the things that I have to do. The fact that the snout is short and it has an actual 3/8" square drive on the end means that it can get into tighter spots than the 1/4" battery-operated impacts that most of the other companies have gone to. Anyone can use this tool, but a professional "wrench" will appreciate the design better than most.
Pros: Can get into tight spaces, Easy To Store, Easy To Use, Fast recharge time, Good Grip, Lightweight, Powerful, Strong
Summary: This is a great tool to supplement a 3/8" drive ratchet. Most fasteners that you encounter working on cars and machines fall into this range. It especially shines for repetitious tasks like oil pans and valve covers. Go up to a 1/2" drive impact for changing wheels and bigger fasteners.
Pros: Easy Control, Ergonomic Design, Good balance, Good fit and finish, Good Grip, Highly visible color, Lightweight, Long battery life, Powerful Torque