I have just about every tool known to man and I was still using my compressor and IR air impact wrench until a few weeks ago. That IR impact and I have been through a lot of installs for myself, friends and neighbors. It's a pain I the butt howerver to fire up the compressor and get all the hosing and tools hooked up.
Then this happened.
This thing has 1100 ft lbs of torque in reverse and will take off nuts my air wrench couldn't dream of. After doing the suspension drop on my car I took apart a child's wooden swingset that had about 50 lag and regular bolts. Still had 2 bars of juice. it's a little pricey but Milwaukee is running a $100 trade-in program through October.