[Bill Baer]

I've had two, both millers an enconotig which was excellent on Chrome Molly and so so on aluminum I replaced it with a dynasty which does well on everything and is definately better on aluminum but it was more expensive.
And I have yet to figure out how to use all of it's features.
I haven't tried the Lincoln had a cheap one (stick welder) that I converted to a DC machine and it welds fairly well for a stick welder.
I know most stock cars are welded with mig welders but I have also seen in one case nice looking mig welds that failed in an accident. Obvious you can use one for a mild steel cage but you need to have it set up right to insure sound welds.