Hi everyone, I'm about to purchase a 2015 s3 at my lbs, however noticed that the Crankset was not the usual rotor 3d but instead in its place were FSA chainrings and FSA sl-k carbon fibre crank arms. The owner told me that cervelo had a few bikes that were sent out with defective rotor cranksets so in place, replaced them with the FSA. Anyhow, I'm by no means an expert so was wondering if this is considered an upgrade, downgrade or neutral? There was another s3 in the shop that had the rotor so I could always ask them to switch it, but would love to hear your opinion. Thanks!