Has anyone here used a water torch? Do you like it?

I talked to someone at a show who uses one, and likes it. I decided
to do a little investigation, and I feel like I have stepped into an
alternate universe.

Google searches for water torch quickly lead to searches for fuel
cells, and suddenly I was seeing promises to increase my gas
mileage.

I would like to hear feedback from anyone with any experience with
one.

GLO