Hobart Welders ARE miller welders...... They are owned by miller electric, are the exact same, and have all the same internal components.. Heck, most of the transformers, etc have the Miller "M" stamped on them......
I've got a Hobart 125 with a gas kit, it is great... My next welder will be a Hobart Fabricator (we have one at work... You wanna talk about a BEAST......... You can burn through 1/2" stuff if you turn it up enough.)