I have no first hand experience, but I have heard numerous issues ranging from mold to mice tunneling into the foam. I'm not sure I'd ever want one because of the possible problems and limitations of attaching things to the walls.
But with all that being said, I would do quite a bit of research and speak with someone that actually has had one for a few years. I DO like the energy savings tho!!
__________________ Jimmy
69 Camaro - Twin Turbo'd
58 Nomad -348 Baby Rat
www.fquick.com/shmoov69