I have the Lincoln at my parent's house. That's the one I am using for my air ride stuff. Little 3/8, mostly 1/4 and 3/16 stuff. Works pretty well.
I also have a Hobart Handler at work, pretty much the same size as the Lincoln. I haven't welded anything over 3/16 with that but I am sure it can handle as much at the other.
Only problem I had with either was due to my stupid head. On the Hobart the 035 tip clogged so I bought some more tips. Well, I put a 030 tip on for the 035 wire. Whoops!
Nick