Yes, I bought 1 a few years ago, just the small unit, it was on my door step in 10 days
It was fairly easy to install, about 4 or 5 hours.
Pro's
very fuel efficient, about .25 litre/hour
very effective, we sat in the camper in "t shirts" when it was 4c or 5c outside
depending on how you can set it up, you can use it to dry clothes etc
don't need a plumber to set it up, not like the gas units
extra fuel is safe and easy to carry
Cons
Some people say they are noisy, a bit like a very muffled jet engine, but at 5 or 6 metres it was just audible (to me )
When I was selling my camper most people didn't seem to think the heater was worth any extra $$'s so I took it out and installed it into the new van
If I was ever getting another camper it would be the 1st mod I would do.
As the add says "just do it "
cheers Keith