These are certainly "Cool Tools!" The first one I ever used belongs to Tom Ferry, and I've been trying to justify one ever since. What's held me back so far is the cost to uses ratio. (and the fact that I'm trying to save up for a new truck
)
It's one of those tools that allows you to do things that no other tool can... spot welding billets, very controlled/localized heats, etc.
Maybe one of these days!
Congrats on acquiring it!!