I have had my 318BHS for about 9 months now and love it. I agree about the mattress - does anyone like that thing? If many people are replacing it, what a waste of resources. I think PT can do better.
I assumed that when the switch over took place on the tanks, that black lever would move over. This made me assume I am still on the first tank (temperate climate, we almost never use the heater, and when we do, we often opt for electric)
I think one of my main complains would be the dinette - they could have given us access doors or drawers. It is such a pain to get the space, we dont use it as much as we could. An intergrated cover over the stove would be nice, too.