Has anyone ever heard of Insulspan Structural Insulated Panel Systems (SIPS), for creating the framework? Or Insulated Concrete Forms (ICFs)? These are built offsite and then assembled onsite. They are supposed to be greener and cheaper than regular onsite building and building materials.
The SIPs are made of rigid foam insulation laminated between two layers of structural board.
The ICFs are forms for poured concrete walls that stay in place as a permanent part of the wall and are supposed to create a warm, solid foundation to build the SIP structure.

I'm wondering if we should go this route, so has anyone ever heard of these or used them?
Thank you.