The old full-size 18V DeWalt DW059 impact wrench with a hog ring was (is) a great value. I looked just a minute ago on Amazon and the newer 20V ones are $300! With the same max torque! Highway robbery.
The DW059 was $70, if memory serves, and it still works great. It looks like you can still get them on eBay for about that price, and at least in my hands, it has proven very difficult to destroy. (the same cannot be said of their drill/driver and right angle drivers, but the rotary hammer still works well)
The open acorn OEM nuts on the model 3 are quite nice and can take a real beating with an impact wrench. Probably a good idea to always start by hand threading them on, but after that, BRRRRAP. Then torque to 130 ft/lb and done.