[RickM]

Precision feed and current control are important. These are usually seen on the better welders. If you can spend a few more bucks for a tool you'll likely have for a long time.

As mentioned on OT before a spool fed gun is pretty much mandatory. Feeding aluminum wire through as steel just doesn't cut it.

I think Thom (Widebody) purchased a spool fed gun for this very purpose. Hopefully he'll chime in with his experience.