Maybe I need to clarify. I have consistently seen mechanics do the wrong thing. Namely, Mr. Goodwrench taking his trusty impact driver to the lugs on a Metro the same way he did on a Cadillac. And if the highly trained mechanic (the same one who has had to rework repairs on my car SEVERAL times) is so damned proficient with an impact wrench why doesn't he use it to torque heads? Rims and rotors are made from the same materials as heads and (on some engines) blocks. But are made of much thinner portions and as likely, if not more likley, to warp from mis-torquing. You want to take them off with an impact wrench be my guest. You want to put them back on with one and I'll see you on the side of the highway in the rain some night with a tire iron in my hand.

There is a time and place for everything, including the use of tools.