My experience is the same as Hedgehopper. Zero problems, not too loud, and the ultimate in convenience.
Regarding fuel consumption, normal use for microwave, battery charging, etc. is fine. But extended running of the AC off the generator on a really hot day will show you the inconvenience of refueling propane. Since most of my traveling does not involve extensive dry camping on extremely hot climates like Georgia in August, it has not been an issue. I usually don't run the air much during the heat of the day, because I am outside enjoying life. but I will run it in spurts when I go inside. When it cools off at night, I open the windows and turn on the fantastic fan.
For 2019, my modus operandi will change a bit, I will be spending more time at the drag strip in Jun, July and August. Extended ac use will probably be needed. I just picked up my new (used ) camper, it came "generator ready", so I might consider an Onan mocrolite 2800 powered by gasoline. Then install a side tank in the bed of the truck, with a marine outboard style fuel connector. Then I can easily top off the generator fuel whenever I am fueling up the truck. THe draw backs vs. propane would be stinkier exhaust and carb gummed up after sitting unused.