just got my power plasma 50 today, what a neat little thing, very small compared to the 250ex, but its really got some spunk. everything is pretty straight forward, i had mess around with the air filter bracket for 5 minutes to make that all fit nice but that was it. I set it up the whole way and put the air like 65-70 and went to town. I cut 1" bar stock, cleanly without weaving, I didn't really buy the machine for that but I think that is pretty impressive for a 50 amp machine. 1/4" aluminum and the like cuts like butter. So as of today, with about 10 minutes of cutting done, i am totally satisfied, we'll see how it holds up i guess.
Chris