I've got a Hobart 190 Mig that came with the aluminum spool gun option. It's 220V only but welds great. The smaller 140 amp unit will run on 120V if needed but I don't think it will run the spool gun. Hobart is owned by Miller and they share consumables as far as I know. I recently ran a Miller 180-something that has an autoset feature and my Hobart beat it hands down for consistancy.