Has always kept me very comfortable in super cold weather in the snow. Never leaks, won't blow over even in very heavy winds.
Pretty much the best winter tent and about half as light as the competition. My only issue is that it's too short. I'm 6'3" and just barely fit.
Haven't tried it out of the snow but I've heard it leaks and gets condensation. I'd say it's not the right tool for that anyway, get a Tarptent for those trips.