Trigger warning - opinions expressed in this post do not conform to current thoughts and practices, take them on board at your own risk of public humiliation
The 6 bobbin disk is disliked by many, for various reasons that people never really go into, yes it rattles ( a lot), but so does a Ducati dry clutch - I call it character. I hear of seized bobbins and other issues, but that affects other discs too.
I have a 6 bobbin disk on my M2, it is running the replacement bobbin kit (which quietens it done a lot but not totally), I have had no issues with it in the 20 years of the bikes life (other than replacing the bobbins once)and it is still in a serviceable condition today. Sitting in a draw is a brand new updated Buell disc that will be fitted the next time the front wheel is out. I'm not replacing the disc through necessity, as there is not an issue with the current one and it works fine, but rather (a pathetic reason really) so that other owners don’t 'knock' my bike for not having the latest or greatest disc (this has happened). My old disc will go into a draw and marked up as spare for potential re-use in the future.

_________________
Today my pet mouse Elvis died

..................He was caught in a trap
There are two types of people in this world, those that can extrapolate