I don't think Clottey is the guy to test your chin, Cintron would be, but not CLottey. I think Clottey doesn't have a lot of power, but he will definitely test Berto's ability to fight properly for 12 rounds. If he gets sloppy against Clottey I think like against Collazo he will picked apart, but I could also see him doing better than Cotto against Clottey because of his speed and superior ability to move.