I know they make their own air tools.
souix also makes a lot of their air tools. Their drills (which are outstanding) are souix, and their die grinders may be as well. I haven't figured out their impacts yet, I think they may be CP, but not sure.
as others have stated, for price I would go with dewalt, especially because you have batteries that will work on other things. I have yet to be disappointed with anything dewalt. If you have the money, check out the snap-on. The ingersolls look interesting as well, and I would look into those if I didn't care about battery compatibility.
If they own Souix then they kind of make their own.
I have 4 Milwaukees.
1/4" Hex & square grive
3/8" square drive
1/2" Square drive.
All are the newer 18 volt Lithium Ion
The 1/2" is 450 ft/lbs.
I think that is under rated / what a work horse.
I too have been using it more than my composite 1/2" IR2131
Just wish it had a variable torque setting.
It is so darn easy to over torque bolt with it at first.
I am going to invest in some pre-set torque sockets.
Accutorq (ACC10-0322) 10 Piece Lug Nut Torque Socket Set - Amazon.com
<img src="http://www.tractorbynet.com/forums/attachment.php?attachmentid=294628"/>
I recommend buying a quality torque wrench (snap on) instead of torque sticks, they are not that accurate.
I have always wondered how these work, it is usually not very clear. Are they simply made to different "springyness" and absorb impacts past a certain point, or what? Also, how inaccurate are they? For things like wheels, wouldn't +/- 10% be acceptable, or are they worse than that?