They're in service extensively where I work. I particularly like the firring strip feature on the inside, making a finished interior wall very easy to do if one chooses to. I believe you can spec window spaces and placements as well. If you want I'll get ahold of the contractor, so you can get his experience with it. If they're for a foundation, an insulated cellar or crawl space is certainly the way to go in these times, when energy to heat will almost surely get very expensive once again.
This looks very interesting too, but I don't know of anyone
around here who has used it.
Concrete fgrms made out of insulation
http://www.owenscorning.com/foldform/Imagine as a contractor not stocking your own metal forms or a form truck, and having your forms delivered to the site for you. Not sure why they haven't caught on stronger yet. Change takes time I s'pose.
Some other cool things I saw at a home show last Winter - vinyl siding that is the spittin' image of cedar shakes, in colors. From 10 feet away, you can't tell the difference. Also - concrete and recycled glass countertops.