That's interesting, it's a nice looking bag in the photie. The Macpac waterproof bags are heavy and a bit short on fill, the Exped ones are expensive and hard to get a hold of.
I see it's got vertical baffles over the chest and a double zip baffle which is good to see. I wonder how the "keep eVent clean!" warning will affect the bags. I've had an eVent bivy from Big Agnes on long term test and that's one of the things that's been on mind, potentially higher frequency maintenance.