@clint on brazil we actually have a lot of those houses. Pros: they isolate perfectly, so warming it up / down is only really needed once and then you can keep it closed. Also, transportation. Also, it never ever breaks. A meteorite can crash on it and it wont have a scratch.
Downs: sizes are fixed (you can plug several together, but they are all the same size), and you need special tools to work with it. Placing a nail on the wall needs some special equipment.