I purchased the 19.2 v cordless impact from Harbor Freight for $70 and tried it yesterday.
It refused to budge 4 of 5 lug nuts on my Jeep. Manually removing the remaining ones required a torque wrench to be set at 130 lb/ft to avoid it's click first. HF claims 220 lb/ft, certainly not with this one. It sounds bad on a "free rev",sort of a high pitched whine, so perhaps this one is NG.
I actually bought two,one for a friend who builds weight training machines who thinks it will suffice for his purposes, so I'm thinking of opening the other to see if same.
Maybe I will cut the motor brushes to match the profile of the commutator in hopes this thing will produce more torque.
The good part is it comes with a nice case, four sockets and TWO sets of extra brushes.
The jury is still out on this one.
Sometimes you get lucky on this cheapo stuff but usually not. The trouble is even if a good product comes around it's usually a one time occurance as these importers will change vendors for a half cent price improvement.