First, from an engineering perspective, this product is really cool and maybe for some well-funded Tour de France team it could make sense to test this out. But the price point, the lack of compatibility with components of existing drivetrains and the lack of compelling reasons to make the change, are going to be headwinds to adoption.<p>On page 3 of their brochure (<a href="https://www.ceramicspeed.com/media/2979/driven_brochure.pdf" rel="nofollow">https://www.ceramicspeed.com/media/2979/driven_brochure.pdf</a>), they're showing 0.5% - 1.0% efficiency gains over a traditional drivetrain that is <i>cross-chained</i>, meaning that if you use a traditional drivetrain correctly (i.e., shifting so as not to cross-chain) the gains are likely significantly smaller.<p>As ben7799 said, this company is primarily in the business of selling very expensive products that have minimal impact on performance.