I bought this on impulse a week before my Rainier summit. Was necessary as my Rab Microlight isn't quite a sub-zero jacket.
Turns out the weather was pretty spectacular and the Greenland might have been more than enough (roughly 20* low). But i was super warm when we stopped and really comfortable the entire way up. Rocked this jacket at the summit in warmer than expected weather and was comfortable with the jacket unzipped.
Now the technicals:
Zippers engage well,
double zippers means you can zip up from bottom to access harness, or fly.
Big pocket for nalgene is great for that summit rest stop.
Baffles are massive and puffy keeps you super warm
Hood is huge!
cinches are great for keeping face warm
Stuffs into its own cavernous pocket for a really nice camp pillow. Not too firm, not too soft and almost half the size of a queen!
Wrist straps adjust to get the jacket sealed and wind resistant.