The quality is excellent, and each part of the fabric is perfectly contoured to fit. The chamois is a step up from the one in my older pair of Castelli bibs. It's super light and minimalist.
Castelli sizing, however, makes no sense. I wear a large in everything, so I ordered an XL, knowing Castelli runs small. My other set of Castelli bibs is XL. I tried these on and could barely squeeze into them, so I had to exchange them for XXL. It's hard to buy Castelli because the sizing isn't consistent.
Very nicely made bibs, fabric feels good, and most importantly the chamois is very comfortable for longer rides. My only gripe is the leg grippers can make it hard to adjust the fit if your legs are on the thicker side. Sizing is as expected from Castelli, I ordered 2XL and I am 6'3" 220. Compared to other bibs, this feels a bit tight on the length, but I didn't think 3XL would solve that problem.