Rating: 5 / 5
Warm while walking below 10 degree farenheit. Zips into North Face shell, not Patagonia, Mountain Hadware Phanotm or Marmots, not even the NF Summit series would. Green color is nice. 5'-9" 200 lbs stocky, XL fits well after not being able to source a L.
Will report back after 7+ hr sits in 20-30 deg hunting, layered correctly.
Time will tell but first impression is good and unconditional warranty speaks for itself. Down leakage is minimal. Not having that much experience with down I would say that this verbiage "High-lofting Bean Tested®; 850-fill down insulation is exceptionally lighter than our 650-fill down insulations, yet every bit as warm." is there for a reason, because IMO it is more of a 700 down fill weight, but has exceptional warmth:weight and ideal for 99% of conditions when coupled with approptiate shell.