I have this like-new Miller Maxstar welder just sitting here looking pretty on my shelf. It has seen an hour of use at most, and that hour blew my mind. I didn't know arc welding could be so smooth, the unit will work hard to maintain an perfect arc even if you are a little shakey, but the second you start to pull up it will sense this and extinguish the arc instantly. I learned to arc weld using batteries so it feels like magic to have a computerized unit. Of course the real value of this welder is the DC TIG feature, but I'm not a competent TIG welder so I cant tell you much about that. Will run on any 1 phase or 3 phase power you throw at it, up to 480vac. 8 BTC.