This is the stuff that allegedly competes with Momentum. I've heard tell it's the same stuff. I don't know.
It is indeed light stuff. My only complaint is that it feels a lot more "plasticky" than regular RS I've used.
I'm using some to make a down TQ and I've noticed that where I pin it, the holes don't "heal". When I've used 1.9oz and 1.7oz, after a while where you pin it, the fabric works it's way back together. Doesn't seem to be the case with this stuff. Now I have this nice piece of shell for a down quilt that has pretty good sized pin-holes along each seam.
Anybody else noticed this issue? Is it really an issue? I've wondered if tumbling it in a cold dryer would make it any better. On the plus side, since I was sewing the baffles, they all have a little overlay of NoSeeUm inside them, so I don't think down leakage will be a problem.