As far as flying debris is concerned, the 2" thickness of each wall is thicker than the wall on a CMU block. Also, cmu is around 1750 psi concrete maximum, this stuff is likely higher as it is seems to be a little bit of a stiffer mix. Their website claims 6000 psi, which is what I would expect. I think that this is sufficient for most building code projectile resistance. If you put in a something like horizontal joint reinforcing, you are essentially casting an in situ CMU wall. External walls, you would need some sort of vertical bars going into a foundation for overturning resistance. All in all, it seems like a pretty neat thing. You could get some crazy organic shapes out of this too with out complicated formwork. I would go ahead and do a cementitious parge over the ridges to make is look a bit better though.