I have one too and it does work well but it takes a lot of practice and good regulators to run at the 4 pounds. The old timer sheet metal masters swear by them for thin stuff. I took a class one time and this old Canadian dude made it look so easy. He said by using this welder it doesn't work harden the metal and you can run it through an english wheel without the problems caused by migs or tigs. I don't know myself because I don't use it every day like he does.