Do you mean MultiMatic 215? The Milermatic is a MIG box. The MultiMatic is a multi-function DC TIG, MIG, Stick box with MIG Aluminum via Spoolgun, and Flux Core cable box.
I have the MultiMatic 200 (predecessor to 215) and really like it. I also have an AC/DC TIG for special purposes. But the Multi is a great box, full of capabilities and I still use it regularly. MIG welds like a dream, a surprisingly buttery arc or TIG, and Stick welds unusually well for the size box it is. I have only a single complaint that it is "Lift Arc" only for TIG. A HF start would make it a homer in my book.
Hope that helps-