Regarding the MIP puck stystem, I am using the AVID caged (Ceramic) thrust ball assembly in my (MIP/Puck) setup & have no issues at all. The diff (with AVID Carbide 3/32 diff balls, is smooth and after a thorough break in, still strong without the need to tighten it. The Puck system was a huge difference in weight & acceleration, well worth every penny. I have at least 10 race days on the first set of orange/plastic pucks & the out drives & pucks still look like new.