That Blackline one looks pretty decent, and same knobs as my own, albeit yes in different places. Ultimately most of the affordable stuff is made in China, including my old R-Tech.
After a year or so, the gas solenoid in mine failed and I had to open it up to investigate. They sent me out a new solenoid and it's been fine ever since.

Normally it would have been a return to base warranty, but in my case it would have been mental to bother shipping it back and forward for such a simple fault, and they were happy enough to just send me the part it needed.

But much as the post above....once you've had a tool like a welder. Doesnt really matter how often it's used....if it's broke, you'll either need it fixed asap or you'll just buy another.

They are an invaluable tool to have. I know if mine broke I'd spend the money again without hesitation. Still not sure I'd opt for a cheaper unit though. But as we all know, all the chinese crap has come a long way from when it all first appeared and quality is generally pretty good. Hopefully more so from UK suppliers who are taking up warranty responsibilities.
Years ago, many were buying direct from China which would be more problematic.

The power aspect is worth noting though.

At lower currents most could run quite happily off a standard 13A plug. I wired mine for a 16A socket anyway.

But that 250A machine is asking for a dedicated 32A socket.

I'd say below say 160-170A it'd still be ok for short blasts on a 13A plug. But for heavier work and especially thick alloy work, it will need the bigger power supply, as it does sap a lot of power and you dont want to be overloading circuits and wiring.