Simply outstanding, especially at 2 lbs 10 oz. I'm lazy and hate carrying bivy gear, but this thing makes me reconsider. Sometimes.
-Good zippers (3/4 length to save weight)
-Great draft tube and all the other neat stuff
-Fabric doesn't inspire thoughts of 'wow that's durable'
-3/4 zipper is a double edged sword, while it saves weight, it decreases the versatility insofar that in warmer climates, you might have to use the bag as a comforter instead of a bag.
-Slim cut, if you have wide shoulders or are a bigger dude, this could be an issue if you don't like being 'cozy' - fortunately I'm all of 5'7 170 so not much of an issue for me, but imagining being any bigger and I'd be bummed.