I bought the MSR AC Bivy for my hike of over 1000 miles on the Pacific Crest Trail this year. This bivy was my shelter nearly every night for over 3 months, and I never got tired of it.
I particularly enjoy laying out under the stars, yet being sheltered inside the bivy from the elements and insects. The envelop design with a mesh panel allows for celestial views, and makes it easy enough to slip
This review was written in the old system and had content requirements that are different than reviews written today.