They replace some of the aggregate in the concrete with vermiculite -that's the main difference. Anyway, this outfit did a presentation at our local chapter and I've been all over their web site and I just wanted to know if anyone ever saw it in person. The reason I ask is because you just have to be suspicious of a product that megahypes up a pseudo-problem just before advertising itself as the cure. This stuff is essentially a spray-in crawl space floor. They are currently capitalizing on it's mold-reducing powers, but also promote it as a radon barrier, moisture barrier, rat and bug barrier, and rubble-wall-stabilizer. It's kind of a Gromicko-esque marketing foray, but that's why I don't pay attention to the marketing department, I want to hear from folks who have crawled over it. I have crawled on it and I had to add a paragraph in my report about how I could not be held responsible for damage to it while in the crawl space. It serves a limited purpose - it makes the crawl look great. When you crawl on it you crack it most of the time, it shrinks some of the time, it causes the soil to dry out and shrink, which causes collapse. It does not keep out a water problem, but hides it until the water overtakes the "crete". I am less impressed with this than I am with the Plastic barrier type crawl space seals.