I have had my Kuiu for a few years back when they were still giving 30% birthday discounts. Its a 0 degree and has been warm and durable. I used it in a windy blizzard inside my canvas cutter and another time into the low teens and have never been cold. My mother and I camped at 11,000 feet to climb White Mountain and she froze in her similarly rated Feathered Friends and I was just fine. Purely anecdotal and obviously individual tolerances vary, but I can't recommend the FF when you are paying this much for a bag.