Familiarity: I've used it once or twice and have initial impressions
Fit: Runs small
First Impressions: I love this jacket. I've only had the chance to wear it on one ride so far but I think this will be my go-to shell this fall/winter on the bike. I wore a summer jersey underneath with temps in the high 40's to low 50's and was very comfortable. I think with some layering, riding into the 30's will be manageable. It breathes as well as it blocks the wind. Which it does very, very well.
Sizing: Form Fit. So if you want to add some extra layers under the jacket I would recommend sizing up if you are close to being in between sizes. For reference, I am 6'1" and 165lbs and went with the Large. I would normally be a Medium in most jackets but this PRO line is form fitting so I sized up.