I've got the little 20v max XR with 150lb ft torque. It's a wonderful light weight tool (with the small bat) to do this kind of work. I also have a few 1/4 inch impacts. They are not good enough for this. They don't have the loosening power for anything more than a small bolt. And they are a pain, as sockets need an adapter. Again, I feel this size tool is ideal for what you want.