Kobalt 3/8ths = LOVE IT rated 225 iirc, used commercially for about 5 months now, oiled daily, still works like new, must learn to use it properly though or you will snap many bolts. $50 from Lowes, far superior to the $50 home depot 3/8 impact
Kobalt 1/2" = Brand new out of the box, oiled it, failed halfway through first bolt! will try another one soon though. The $100 lowes 525 model, they also have a slightkly different version rated at 575 for another $30
CampbellHausfield 1/2" = Cheap, pretty

also. Rated at 325 maybe? Definitly has trouble pushing past 70-80 ft/lbs. It's good only for speedy lug nut removal, I still have to crack 50% of the bolts loose manually, the majority of lugs have to be broken loose on the ground still than use the impact.