like everything else, you get what you pay for. that said, however, the coleman tools aren't all that bad. some really suck, but some are okay. i have the 3/8" air ratchet and the mini die grinder, as well as the 3" cut off wheel. i do make my living with these tools, and the ones i have seem to be holding up pretty good. if you get the die grinder, get good burrs, though. it is a little weak, but with a sharp burr it keeps up alright.
the impacts suck a##, though. rated at 250lbs/ft, not even close. (i don't own one, but my snap on gun was getting rebuilt) i hammered on a wheel nut with one for about five minutes without budging it. hit it once with my blue point 3/8" gun and ziiiip.... off she came. (that gun is only 200 lbs... go figure)
the air hammer has too fast of a blow rate, it's really hard to control. the chisels and punches are really not all that good either