1/2 cordless impact opinions

I had been looking to buy a 1/2 impact. Driving down the highway one day and spotted something on the road-stopped and picked it up. An 18.2 volt Craftsman sawzall, it had been run over but was not broke and still worked fine. So off to Sears I went and the 1/2 impacts were on sale, bought one with charger and an extra battery. Sometime later I needed a 1/2 in drill, bought Craftsman again, same batteries. I know most of the big names are better, but I've been happy so far. I always take an extra charged battery with me and have never ran out of battery power yet!