They were generally well thought of, but had a number of design changes over the years and I wish I could remember all the details (we seriously looked at buying one of that period 10+ years ago)
The key is look at the underside, if there is a barrier under the tanks, sealing the bottom, the tanks are probably heated via the propane furnace. If the tanks are exposed, the answer is no.
2008 F350SD V10 with an 2012 Arctic Fox 29-5E
When someone tells you to buy the same rig they own, listen, they might be right. When they tell you to buy a different rig then they own, really pay attention, they probably know something you don't.