Summary: I've been needing a nice impact wrench because I swap wheels regularly (several times a week). I chose an electric one because I'm using it to quickly mount/dismount wheels at the track where access to an airhose is nigh on impossible unless you brought a compressor. for the TL;DR people: Pros: Breaks 90 ft/lbs lugs reliably, I haven't had it fail yet after 4 mount/dismount sessions.
Summary: Impact driver has good power. Really like the batteries and they are the main reason I purchased this tool. There was only about a $20 differential between getting 2 batteries and a charger and getting this kit.
Summary: I like this buy. Its expensive but helps cut down on auto work. Powerful for battery operated tool. Strong enough to remove wheel lugs. You need air power for heavy stuff. Nice and compact. Great quality.
Summary: These batteries are fantastic, and work with my older DeWalt drill from 1997. While they don't match up perfectly, they still lock in place, so I'm not concerned about how they look. As for the impact wrench, I've used it only four times to see what it can do, and I don't feel like I've even put a dent in its' capability. In four hours of pretty constant use, each battery performs incredibly well, and I'm overall pleased with my purchase.