Summary: I torque my lug nuts no more than 80 pounds. It took them right off but so what? Well, it means, I can jack the car up then remove the lug nuts instead of braking them loose first, worth the price of admission right there. I had an axle go bad and the shop refused to torque the axle nut. They used an impact gun. It should have been 145 pounds and it was more. So this thing zipped it right off and I re-torqued it.
Summary: This is a great tool and I would fight you before you could take it away from me. The half inch anvil on it is tight as others have said, but I prefer it that way. I believe tightness makes stronger impact activity. Loose attachments take away from impact strength. I'm giving it just four stars because it's not as powerful as advertised. It removed all the bolts in my sub frame and wheels.
Summary: To work on a car this impact tool is a little heavy so depending where you need to untighten a bolt you may run into difficulties. Nonetheless it does a good job. I used it on brake caliper bolts and lug nuts, it did the job. On an axle nut (torqued at 180 ft lb at the factory but obviously rusted after 10 years of driving...) it would not move it and I had to get a cheater bar of 48".