I don't know about the newer welders, but I used to weld all day, every day, and the Lincolns were smoother. The Millers were ok, but they were edgy and would gouge. The NAPA, Mack, SNAPON, etc were made by Marquette in Canada, at least up through the 90's. They are sold under Century now, not sure how good they are, but the old ones were ok. I have a 250a mig from then and it will weld all day long, same from start to finish. If you are shopping for welders, the duty cycle tells the tale as to how heavy it's built. Eastwoods are built by a Chinese company, they sell under numerous brands, from what I've read. I was shopping for a plasma several years back, that's how I discovered that.