Simple and effective
I have spent over 50 nights in this bivy bag and loved it. But there are no bells or whistles, no hoop or anything over the face. You have to be someone who doesn't mind being uncomfortable. But the simplicity and minimalism of this set up is awesome. I did a twenty one day ski traverse and slept well every night in this baby, except for one crazy snowstorm night where I curled in with the boys.
Its super effective at what it does, weighs nothing but is not comfy when stuck in for 30 hours... no hoop is for the hardcores, since the fabric always falls into your face...