Let me first off say that I've owned bibs and shorts from nearly every maker- including other models of Castelli.
Without a doubt, these just sucked.
Why you ask? The stitching was terrible. After one long ride, the stitching started pulling and coming undone on the thighs. So, I returned them. Got another pair thinking that I'd received a bad pair. You guessed it- next pair, all of the stitching came undone one one thigh and started stretching and coming undone on the other.
I like Castelli, but they have really sacrificed quality on these.