I love my 18volt panasonic cordless tools too. i just purchased the Drill circular saw and the reciprocating saw about 3 weeks ago. I like them much better than the 14.4 V dewalt kit that is now in the Satellite technicians Van. I also bought the panasonic 3.6 volt cordless screwdriver as the Milwaukee one i have the switch is sticking on it.
I've got the hammer drill. It works well as a drill, but you can't beat a rotary hammer for drilling concrete. Any hammer drill is a toy next to a rotary hammer. A hammer drill just doesn't have the punch.
I second what Dave said. I have a 1/2" hammer drill that does a decent job shooting holes for TapCons and such but when I was trying to punch some 3/4" holes for a raceway this thing just beat me up and made some dust. My neighbor came over with his rotary hammer and it went like we were drilling balsa wood. I got a chance to play with a Hilti at one of those road shows and they make a real nice one. You can poke 1" holes in concrete with no real feedback at the tool.
Umm, I might have started this Panasonic thing, via the Chat room. I'm not saying it's wrong, Panasonic make some bloody good drill units and other tools and the battery units don't bugger up after a few charges, no matter how much you abuse them. Panasonic was the first company to use NiMh batteries. My 12V NiMH batteries are still going strong and I can still driil through a power pole (300mm) with an Auger bit, at least 3 or 4 times. Auger bit being 1". At the end of the day, it is the drill motor and battery that makes the difference. Some manufacturers should be ashamed to put what they call motors in thier drills. Brushes?, get real!.