I have also found this material at (kitebuilder and it seems quite interesting to me - it might be a "poor man's cuben". The weight 0.75 oz/sq yd is final - it is a laminate, so there is no coating to be counted extra. The weight is better than silnylon or spinnaker, and it has one advantage - it is completely waterproof. It might be worth a try.
Compared to cuben, it is heavier (but maybe also thicker and more durable), and the scrim seems to be different, not so dense. It may not be possible to sew this material, but kitebuilder offers the sailmaker's tape for quite good price too (no sewing may be an advantage for someone).
The only thing that prevents me from trying it is the cost of international shipping. Would anybody else try it?