I have ThermaDyne's Cutmaster 38 and find it near useless on steel over 1/8" thick or about 20 gauge aluminum so despite it's good name it turned out to be a bad experiment. I use too much filtering I guess or it's bad air up here, or something. Wish I'd have had the nerve to experiment with one of those instead; it would have saved me about $800.
Who knows, maybe it would have surprised me.
Anyone want to buy a name brand plasma cutter so I can get a crappy Chinese one that'll do the job?
Bummer about your 38. I haven't had any problems with my 51, even at 1/2".