[Evans, Marv]

I've never heard of it, so I don't have any "real world" experience. I did look at the website and thought it was interesting.. First, preparation and installation are key to any project, just like prepping for a good paint job is required for a car & other things. As a general rule, portions of projects or whole projects (like manufactured homes) manufactured at a central or main facility and put together at the site are more precise and better made than onsite construction. I've also never heard of 5K psi concrete, but the design and production (based on the website) look like something I would seriously consider. It looks to me to have advantages over a traditional poured foundation. I would also assume the panels meet engineering and design requirements to handle the stresses and loads. If you're thinking of having an outside inspection done before buying, you might try to find someone familiar with it.