Great jacket for wind, rain, and cool weather protection. I have used it several times with one base layer when temperatures were in the 40s and have been comfortable. And the ability to remove lower sleeves is a big bonus when temperatures rise. Trim fit thru torso and arms.
It is expensive. However, it is flexible. I have worn this with a merino base layer, and regular jersey at around 38F and been comfortable. I have also worn this with a jersey and the vents open at 48F and been comfortable.
The only con I will say is the fit. It is tight in the shoulders and the arms are snug where the sleeves zip on. I was about to return what I ordered which is a medium (I normally wear small so still size up) as it felt overly tight then I got on the bike. In a riding position where it is tight is just right.