Bought this shell specifically for winter and really have been QUITE happy with it, with very few exceptions. Everyone else's reviews have been pretty fair and accurate with regard to size, pros and cons etc etc... the thumb holes in the cuffs are pretty rad for keeping your sleeves from pulling up. Breathes plenty and yet keeps you warm with the right layering system underneath. The arms ARE a bit snug, but not so much that it's uncomfortable. The asymmetrical zip system works nice as well.... I figured that zipping from the bottom to the top BEFORE taking it off and then putting it ON that way really helps the process :) I think pit zips would really be the only other feature that would be helpful (and slightly better waterproof material -- but hey, it doesn't rain in the winter!)
Overall great jacket!!!