I have the 6' left zipper. I've had it for about two years now. The quality of construction is as good as it gets, the sewing is flawless. It's generously sized - it has enough room for me to use it with two sleeping pads, my normal quilt, and a synthetic overquilt in the winter. It's also tall enough that with a 6' long pad in it there's still about 10 inches of space above your head to store your headlamp, gloves, etc. If you have a Katabatic quilt, it has a set of 4 D-rings on the inside that are lined up with the pad clips on his quilts, so it's easy to secure your bivy, pad and quilt together to keep stuff from shifting around at night.
My only minor nitpick is that the hang loop for the netting was sewn in such a way that it slightly interfered with the zipper. I bent it back over on itself and put a few hand stitches through it and that fixed it.
The Pertex Quantum top is a good mix of windproofness and breathability. It's very comfortable on windy nights. I sleep out under the stars with it all the time, including one really windy night below the Lyell Glacier in Yosemite, and it kept the drafts off my face and out of my quilt. I haven't had any problems with condensation.
I would buy it again.
EDIT: Mine weighs exactly the spec'd amount, 7.0 oz.