I have been very happy with my 19.2V Craftsman setup. I even have the 1/2" impact and they now offer a 4.5" angle grinder. My dad has had the same kit for over 10 years, mine is at least 6 years old.
My batteries finally went bad so I converted it to Li-ion. You pretty much have to have the Li-ion batteries for the impact.
I have the 4 place battery maintainer that way they are always charged. It charges them, shuts down and checks them every 5 days to see if they need charged.