I have used some of this kind (kite fabric?). Not sure about longevity, but very strong, no sagging, no elasticity (got to use cat cuts).I think weight very near to cuben.
Waterproof, as far as I know, but different qualities: some have really good enduction, even contact with water, like for a ground cloth on soaked ground, nothing seeps through. Some, not that good.
Cons: the smallest puncture, even a pin hole, doesn't "self-seal like silnylon, does (a bit...)
Extremely noisy, and quite difficult to pack properly (a bit stiff, bulky...)
Some kite fabrics, like chikara, are very good for shelters, waterproof and not so noisy, lightweight and resistant, but on the "bulky" side too.
This shelter is one of them