I bought Everlasts ac/dc 200amp tig/stick/plasma combo box (forgot the exact model) about 10 years ago, use it couple times a week, mostly DC (Ti fixtures for aluminum anodizing), rarely above 120A, often below 50A, as said by Turnworks in post #8, there are some issues with HF start, it doesn't bother me, since I don't weld for hours on end, when the machine arrived, had to open the box and adjust spark gap for HF to work reliably (wouldn't start on low amps), welding at very low amps can be tricky, arc isn't stable, but then I haven't used expensive TIGs so I could compare
anyway, it does what I need it to do well enough for me not to bother getting a better machine
the only repair I did was to replace the pot in the foot pedal, it was losing contact intermittently, new pot was couple EUR, so not an issue
I bought the combo box just because it was basically the same price as the "pure" tig machine back then, tried to set up plasma only once, it arc would constantly go out, couldn't get a consistent cut, I didn't bother to find the problem and haven't used it since in that mode, the rest - stick, ac/dc tig, pulse etc - everything works like it should
oh, and buy a new torch for it, with the super flex cable, I don't think the one that came with my machine back then was useable freehand, walking the cup maybe, it was just way too big and the cable so stiff, delicate movements and holding tight arc was basically impossible