If you're thinking of buying these because they are less expensive than the BodyPaint bibs you'll be happy with the Progetto X2 chamois. However, the reviews are correct that point out the difference in sizing. Those who own Castelli bibs feel they'll be safe in ordering the same size, like I did (mine was XL). I own two sets of the team issued bibs with the Kiss3 chamois and expected that the Endurance bibs would fit the same. They felt about 2 sizes too small. Perhaps this is why the Progetto X2 chaffed at a critical point. The front of the chamois is not as expansive as the Kiss3 and I was surprised to find the seam of the bibs and the seams of the pad uniting right in the front. Maybe a larger size would have eliminated this but I'm hesitant to try.
Otherwise, the bib material is heavier than I expected and the shoulder straps are narrower than I expected. Again, a larger size may have been more pleasant to wear. The Progetto pad is better than the Kiss3 from my perspective. Not significantly noticeable on a shorter ride though.