I've used it once or twice and have initial impressions
I only used this once but these is one of castelli's better designs. Great for fall and late winter/early spring. It would be good for most types of rain you'd actually be riding in, but not very heavy rain because the seems are not taped.
Decent jersey, best design feature is its high rear neck line to keep the sun of the back of your neck, a great feature. Race fit but without being too tight around the shoulders for those who actually have some upper body.
With Castelli you're good if you go for their high end line, otherwise its fairly average at best. This was baggy around the pocket area so if you have anything in there is sags down. In Europe they have a brand called sportful which costs half as much, I would say this is about at that level.