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The product you saw was lite form (or something similar). It is pretty big here in NW Iowa. It is blocks composed of 1.5" styrofoam on each side. It has a skeleton made of plastic and I don't think rebar is required. It is also DIY but I have seen it go terribly wrong when proper prep work is not done. If I were doing an earth home I would do it this way. There are also plastic strips built into the foam that allow for the attachment of drywall directly to the foam. I have wired many houses built with this stuff and routing wires is also pretty easy. We use an electric chainsaw to notch the foam and route the wiring. It is pretty slick stuff.
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