That is the point - you get better heat capacity with low cost. The brake feel doesn't change.Today i take back caprice from service man and start drive with new caprice astro brake rotors mod with PFC pads.
What i say: nothig outstanding or special. All work, no problem, no beating in steering wheel.
But at this moment my rear pads not work. Next week i plan to change my rearend gm8(7.5 2.56) to 8.5 3.08 with same 9" brake drums as i have.
Note for other users: I cuted caprice hub(outter diameter) very stiff with innter diameter of astro rotor. So as i think, it is additional insurance that all make propertly too.
Be careful that rust does not lock the rotor and the hub together on the outside radial edge of the cut-down hub. If you live in the rust belt, watch out for this.