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The downside to CCBs all relate to cost to replace rotors and circumstances that may require replacement.
As noted, CCBs can be damaged by worn pads. They can also be damaged by road debris if you get unlucky.
For me, the biggest concern is that I intend to swap out my summer tires and wheels for winter tires and wheels and vice versa and I will do this in my own garage. I have read that it is all too easy to slip while changing out a wheel and ding the brake rotor. In fact I am sure over the years in previous cars I have done this. Of course with a steel rotor, no harm, no foul. But with CCBs, a slip like that can mean a destroyed rotor.
I have not checked BMW specifically, but I believe a replacement rotor would cost at least $2,000.
If none of the above are concerns for you, then CCBs are all upside as there is less dust, better and fade-free braking, and significantly reduced rotating and unsprung weight.
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