A quick search of the site will bring up many many posts on the subject

I think most structural engineers would prefer SW system to typical concrete block. SW is a great system.

I've had 2 houses with superior precast walls. I love them, they seem far better to me than a block foundation. I'm currently on a very wet lot and I've had zero issues with any leaks.

Superior Walls would much better than block. We considered it, but went ICF (DIY) instead. It's important with any foundation system to have good waterproofing and water management (drainage) to ensure a dry basement.

We have a superior walls foundation in our ongoing new build, foundation was complete in February/beginning of March (2016). I have never lived in a home with this foundation system, but it came highly recommended by basically everyone. We're impressed so far, although we haven't lived with it. It is quite obviously superior to a block foundation when you see it in person. We have a crawlspace foundation with a concrete floor, and it will be conditioned space. Our builder uses this foundation system almost exclusively, and we toured homes he built with full basements as well. Is it ok to post links to a personal blog? The post with the foundation pics is here if you are interested: https://amytracker.wordpress.com/2016/02/29/house-2-0-foundation-and-subfloor/