Awesome bag, but pretty wide
I absolutely love this bag and would have kept it if I was bigger. I was initially torn between the Ultralite and Alpinlite, and ended up with getting the Alpinlite first. After some time in that bag I just found there to be too much dead air from the extra girth, but the Ultralite was snug to the point where I was worried about down compression if I had layers on. I returned the Alpinlite for the Versalite since it fit more snugly and rolled with me when I slept.
While the Versalite is slightly warmer than the Alpinlite or Ultralite bags, the chest girth sizing falls between the Alpinlite and Ultralite, which was perfect for me. The full length zipper allow for easy venting and I have no worries of overheatingI generally sleep very warm. The Versalite also comes with one more ounce of down than the Alpinlite, but is slightly narrower and thus warmer overall and spans a wider degree range. The full length zipper also allows the bag to be opened up and used like a quilt in warmer weather. I have taken both bags down to low 20s and the high teens and slept comfortably in a baselayer with the neck baffle completely loosened in the Versalite. The Alpinlite required me to cinch down both to trap in heat to fill the dead space.
The materials are top notch, the down is super loftyWM bags are great.