I know very little about TIG... tried one once at school, played around with it for an hour or so. very different than MIG, which I have lots of experience with, and stick, which I have a little experience with. Now maybe it was just the settings I was using cause I didn't know what I was doing, but it seems to me that TIG is a LOT slower than MIG or stick. Seems like you could have somewhat better control, though.
My only other experience with TIG was indirect -- when I was working as a welder one of my coworkers convinced the boss to buy a TIG machine, how I don't know, we sure didn't need one for what we were doing. Anyway he spent way too long setting it up and when he finally started playing with it, he kept blowing one of the main fuses to the building. I don't know if it was something wrong with the machine or what... If memory serves it was a 100 AMP unit and we *should* have had enough power to the building but he kept blowing one of the legs nonetheless. So I guess my second question is - do TIGs use more power??