Miller Auto Arc Tig 50A

[aametalmaster]

Looks like its the welder end of an Orbital set up for welding small SS tube. I have a 75 amp version made by a Hobart division...Bob

[Ltbadd]

Been welding for many years, never seen this unit before. Being sold on Craigslist for $400. I wonder if it's any better at low amps then a 210DX?
Anyone ever use this?