I bought a minimally used one from a mobile welder guy who thought it was going to be a good thing for him to have, but he found it almost worthless and sold it to me for 200.00. IIRC it was in the 130 amp range.
I found the handle was big and got hot, the duty cycle was way too low to be of any use as any kind of production welder, it would have been an OK welder for sheet metal with a smaller water cooled torch, but there seemed to be no provision for a water solenoid.
As was stated before, welding aluminum would have been limited.
I used it on a couple of welding jobs but ultimatley found no reason to keep it. ( I do have a 300 amp Hobart square wave that does everything I need with no preoblems.) I sold it for 200.00 to a guy who uses it now on his kid's go-kart repairs.
He's all happy with it...I guess.
At least he hasn't asked for his money back. Hahahahah
A friend of mine recently bought a small thermal dynamics inverter tig...cutest thing I ever saw, carry it with one hand. I need to call him and see how he likes it.