I have had my semi "big brake kit" now for three weeks. I have Power Stop slotted and cross drilled ventilated rotors with ceramic brake pads. These rotors are far more advanced than the plain factory pancake rotors. They offer much more ventilation than the stock rotors. The pads are superior to the expensive factory pads.
Under normal unloaded conditions, the stock brakes work. But under challenging conditions, these improved brake components perform at an increased level with no perceptible fade.