Cheap plasma cutter any good?

I don't see how. I have a Thermo-Dynamics "Cutmaster 51" and it was a fair amount of money used. I bought it used for around 500 and it is barely adequate. It gets "iffy" on 1/2" material, does not always make "plumb" cuts through thick metal.

It was rated for 1/2 "genuine cut", 5/8 "maximum cut" and 3/4 "severance cut". I'll bet that last is rather ugly. It is rated up to 40A but it ran circles around the Horrid Freight one I had