I got one of those used on ebay cheap with the 1/2" and 3/4" heads. It heats up pipe very quick. It's basically like someone took two 60w soldering irons and joined them like scissors. The heads slip on and stay with a set screw.
I was looking at those very closely but they had negative reviews so I didn't get a pair. If you say they do the job well for 1/2 and 3/4 I'm going to get one.