Originally Posted by
carleton
The known downside is that (to my knowledge) the system only provides cogs down to 14t, where some stronger riders like to train and race on 13 or even 12t cogs. There is also the risk of the cog and carrier developing some play between them which can only be eliminated by replacing both. Then there is the fact that the cogs are proprietary. All of this to avoid using a chainwhip to remove a standard threaded cog. Some don't think it's worth it.
I had this concern about Miche cog/carriers, too.
'Till I used 'em. There is some play between the cog and carrier when it's just the two of them, but the lockring contacts both of them - so when it is tight, it is impossible for there to be play.
I've used a set for five years now, and the convenience for cog changes is worth it.
At Kissena, I'd ride to the track on a 17 and race on a 15.
At NSC, it's 16 for warmups, and 15 and 14 for racing.
So great to have one less step for gear changes between races.