Received one of these as part of a package deal with our little camper.  Honestly, only came to own one due to the package deal.  Had I set out to buy one I probably would have picked one of a more modern design that was more expensive.  I read the reviews here, including the leading review that discusses cleaning the valves.  I did that little repair (sure enough, my valves were caked with dark grease), and fired it up.  I have to say, I'm impressed with the heat this little monster puts out.  I was able to bring a small pot of water to a boil in only a few minutes.  Surprisingly quickly!