I am 99% certain they are imported, but I would certainly say don't rule them out because of that.
If Mr john is prepared to put his name to them then they should be pretty well sorted and at least warranty and customer service should be top notch. I work with imported campers also and provided you know what you are doing then a viable product is definitely possible.
With john being a manufacturer not just an importer he will know what works and what doesn't.
It might take them a little while to push through the market, but good luck to them and I really hope they succeed!
Cheers
Evo