Hello W C W,
I looked at them before I settled on the machine I bought, which was from Rtech.
I checked their eBay ads again, just read the bottom for returns policy. I think they do more thqn they limit themselves to in the terms, but it didn't instill me with confidence.
They're only down the road from me, bit I think they're box shifters, so backup may be limited, but the price is about half what I paid for a UK backed machine of Chinese origin.
If you're prepared to take a risk, and the welder isn't business critical item for you, could be considered I guess.