I use an impact to take off and put on all the time. Just when you put them on set your gun to the lowest setting and then use a torque wrench (I just got a new Husky one too for christmas) to get them to 80 ft/lb. I have been using torque wrenches on every set of alloy wheels I have owned and I have a bad ass 700ft/lb 1/2" drive impact. Just have to be conscious of what you are doing. Trust me, after completing a swap the last thing I wanna do is hand tighten eight lugs.