for the money i would say never buy a cordles impact driver.
It could only mean the battery would die fast and the recharge life cant be that long.
Now I dont have an Impact driver but I do go through a lot of
cordless drills in my line of work. (maintenence) and I dont care
what anybody says. I can buy 1 every other year. the biggest problem is the manufactures
change styles so freekin often. That when it comes time to buy replacement
Batteries most" homedepot" type of place no longer carries them.
IMO....if you wont Impact I would say go Air or not at all.