* Mountain bikes are better with them. I hate the low tolerances in terms of adjusting the damn things though.
* I guess they're better with carbon rims on road bikes?
* But the 'limiting factor' in stopping a road bike in most cases is the road/tire contact patch, not the brakes. I can lock up a road bike just fine with caliper brakes.
No mistake, disc brakes offer better braking power and a superior braking experience to rim brakes but the difference is nowhere as big as it used to be.
Carbon rims are becoming more popular across cycling not just on road.
They are stronger, lighter, less fragile and the quality is improving such that I bought a pair with a lifetime warranty.
And carbon rims are worse than aluminium with calliper brakes especially in wet weather conditions.
I'm less convinced about road bikes though.