Let me start by saying I'm not affiliated with Arcteryx. Those who are product testers should not be allowed to vote.
I tried many jackets before choosing this one. I bought it for fit, style and color was a big issue for me. There are many other equally good jackets out there, make sure you get the one that fits in a color you can live with for years becuase they will last a long time. This jacket will work for me down to 40F with only a medium weight base underneath. I don't see my wearing it if it's over 65F unless I really need to stay dry. I'm 5'9", 140 lbs. and a 36 chest, I bought the small and it is a nice intermediate fit, some light layering will work without completly filling the jacket out. One thing I'll mention is the jacket comes about two inches below my belt and in the back covers half my butt. You may need to consider a different jacket if you want lower coverage. I have the nightshade and it is gray in low light and changes to a dark blue/gray in sunlight. 4 stars since it is made in China and not Canada.