I bought this Craftsman 1/2" drive cordless impact wrench about 3 weeks ago and it is a monster! Its a bit pricey at $260 but its around the same price as a small air compressor and pneumatic impact setup. Before the holidays it was $299.
I also got this 27 pc 1/2" drive metric impact socket set;
The impact wrench comes with a nice tool bag, charger, but just one battery. I removed and installed all 4 tires, plus the various bolts for the front/rear lift kit and the battery still had 1/2 charge.
My only gripe about the impact socket set (and I pitched the bitch in a product review) is that it doesn't come with a tool case. The sockets are shipped in two bags in a cardboard box. I spent $20 on a magnetic socket holder which fits well into the tool bag for the impact wrench.
Craftsman also has a cheaper 19.2V 1/2" drive impact rated to 200ft.lbs but I'm reading that its not any good unless you buy the lithium batteries for it. If you buy the lithium battery for the 19.2V impact, this Craftsman Professional impact ends up being cheaper and it comes with a lithium battery.