[rdorman]

.. cross drilled rotors do the same thing as slotted rotors or slotted pads. The allow the super heated gases and particles to escape. It is refered to as 'wiping the fire band' and it is a good thing.

The reduction in swept area is nominal. The reduction in mass can be significant which is a plus in regards to the energy required to turn or stop the mass. The reduction in mass will also result in higher temperature strickly from a kinetic energy standpoint (ignoring ventilation).

Bottom line, all else being equal they will work better than a non-drilled/slotted rotor with little change in peddle feel. Is it worth the money to upgrade a system that works, no (unless of course you take into account the 'cool' factor!)

Rick