I have this crankset on my bike. It has the MegaExo BB system. Lately it has been making a "knocking" and "grinding" noise.I took it in to the LBS and the mechanic there says that the BB is "junk"! He also told me that because of the design of the crankset the problem will occur again if I replace the BB. His advice to me is to replace the FSA carbon crankset with Dura-Ace as Shimano has a much better design. I really like this crankset and I would like to continue using if possible. Any advice or info. that anyone might have would be greatly appreciated.