We looked at a house that was built by CTEN, incidentally the inventor's son's house, who designed it for himself. It was featured in a report in Hus&Hem a year ago. In the latest issue, there's actually another CTEN house from the same architect, it was his first house and is located next to the one we looked at, located in Eriksvik in Nacka.
Seems convenient to build with, but the walls didn't feel "right"
From what I understand, it's mostly styrofoam that's plastered over, so that might explain the somewhat different feeling, very far from a real stone house, one might say.