The only time I had a chance to try a TIG machine, we were doing aluminum. I guess they figured that if you can TIG weld aluminum, steel will be easy. I had a hard time getting the foot pedal thing down. I kept blowing thru the aluminum. For those that have never tried it, Aluminum will blow thru without warning, it doesn't turn red like steel does.
I'd like to play with welding some more. Enrolling in a class wouldn't work with my schedule. Maybe someday I'll just up and buy my own machine. For some nice looking welds, check out Mcteardrops gallery. He TIG welded his frame.