Seen thometing like those generators in france, it's probably chineese made...
from a sustainable ecology point of view it looks a bit bad:
-Only 20 to 30 % of fuel energy is converted to electric power
the rest of potential power is lost into heat and chemical waste.
Even a badly polluting thermal power-plant deals a lot better with use of fuel power.
So, from my point of view its a way, if there is no other ways, or a temporary solution.
(By the way , i'm looking around to buy myself a diesel one , just in case of power failures.If my electric power goes down , then my gas heater won't work).
-the day will come when this machine will fail and then it won' t be possible to repair:
not made any more, no parts for it,go buy a new one...