Tr90 outlay what would I do with it if something went wrong
It depends of what goes wrong. Anti-vac valve, probes, fuses, pump, group parts… Should be relatively simple to replace, with any machine.
If the brainbox, or any other component that is proprietary to the machine pops - they you are at the mercy of the manufacturer and a good centre - irrespectively of the make of the machine. Rocket? I wouldn’t buy one these days.