I have a miller spectrum 375. and I have only had to change tips once in 4 years. I cut up may 55 in my pix with the machine. Very nice cuts with little to no warping, although they can be sharp and cut like a razor after.LOL It will do everthing I will ever need to do as far as plasmas go. I am very happy with it. (desclaimer:I AM NOT afillated with miller in any way shape or form).
I think I couldnt go back to a torch set up, Tim