I have one of those and MANY other Milwaukee 18v tools. Friends have had some battery powered tools thatbhave worked for them over the years. I got some miss matched tools and pretty much gave up on them. My son turned me on to Milwaukee 18v tools and I am sold! I won't even go into the list but I will say a couple of grand later I haven't met a Milwaukee 18v I don't like. I make my own power so why not charge batteries?
I had a Hitachi Hammer Drill / Driver that I've really liked, but was torn if I would go with Metabo (bought Hitachi) or pick something more common...Metabo is also my favorite corded angle grinder, but the cordless sells at a Premium. They also don't offer near the amount of accessories that the Milwaukee does.
The 1/2" impact sold me, they even make a 3/4" and a whopping 1", but this 1/2" is a pretty decent size, and it provides 1400 ft.lbs. of torque. There are some accessories I'd like to get, the string trimmer would be handy, as an example. I'll see how the impact wrench works on those axle bolts today...
This is a pretty good deal as the battery itself is worth over $100 if you go to buy it. I'm looking forward to having a cordless angle grinder. I have one 4-1/2" Milwaukee corded grinder, and 2 x Metabo corded angle grinders (4-1/2" and 6"). That 6" Metabo is really handy for cutting metal tubing and pretty much anything up to about 2-1/2".
EDIT: that 1/2" impact worked a treat on the axle, but the cylinders are wanting to be stubborn on the star adjuster so I sprayed with pb blaster while I fire up the 'que for my kids who's coming over.