I have Hypertherm Powermax 45 (service truck), 65 & 1000 (shop) units and have used both Miller Spectrum (625 & 375) units as well as the Lincoln Tomahawk and Thermal Dynamics (ESAB owned) machines.
Hypertherm is tits, Miller is a close second. Thermal Dynamics makes a solid machine and the Lincoln stuff is disappointing after using the Hypertherm machines. I have no idea how the Chinese built units are, other than to say there are a lot of very happy Everlast owners out there, I just generally don’t see them in industrial uses.
I would rather buy a used machine with good support than a new machine I can’t get parts or service for. That said, a plasma cutter is an invaluable tool if you cut stuff other than steel. I’ve cut watermelon just to prove the point that if it’s a conductive material the machine will cut it.