I've got a Lincoln 200 MIG and had it for 15 years or better. I use it on everything from chassis building to sheet metal, and use it a lot. Still works great, might be needing a new gun one of these days, it's finally starting to show some wear and occasionally an intermittent trigger. Haven't had to replace any rollers or the liner. Very pleased with it. I also have a 300 Miller that stays in the shop on the farm where it's been in use for 20+ years. Quality always ends up being the best value for the dollar, as others have mentioned stay away from the cheap stuff.