Jaime P.wrote a review of Castelli Perfetto Convertible Jacket - Men's on December 27, 2018
Familiarity: I've used it several times
I'm a big guy, so got the 3x. Fits snug - Italian design.
This jacket is great for mid/high 30s into the 50s, I'd guess. I've had one ride in the high 20s with it; wore arm warmers and a vest over the jacket and was plenty warm.
If you have a set of tights that has a built on base layer upper, this is all you'll need to wear, really, over that. Otherwise, you probably won't need anything heavier than a light base layer down to a regular jersey depending on your work rate.
I haven't ridden with removed sleeves, yet, and probably won't. The exposed zipper looks weird. This is the only negative i could think up.