Anthracite, there's many threads on ClubB5 concerning braking!
The 3 OEM vendors mentioned by your technician manufacture excellent products. The Metal Masters brand of PBR/Axxis pads utilizes a very old compound formula which is known to be very harsh on rotors! Instead of Metal Masters, you might want to instruct your technicians to use PBR/Axxis' new Deluxe-Plus compound which produces less brake-dust than the stock Pagid and Jurid pads used by Volkswagen/Audi and isn't harsh on your rotors!
Now let's talk about slotted and drilled rotors.
This is an example of a cross-drilled rotor!
This is an example of a gas-slotted rotor
Nenad's post described a condition called fading where gas and even liquids can delay your brakepads from making full contact with the rotor surface. Slotted and cross drilled rotors prevents fading by removing liquids and gases from the surface. I'm not a huge fan of cross-drilled rotors on street applications because over time the drill points can crack which leads to rotors warping and irregular brakepad wear.
I've seen many quality slotted rotors on the market but my two favorite brands are Powerslot and ATE's Powerdisc line. Your trusted mechanics are leading you in the right direction as far as your brake replacement but have them check out the Deluxe-Plus pads instead of the Metal Masters. Don't forget to bed-in those new pads after the installation, and be sure to flush out your DOT4 brake-fluid every 2 years no matter how many miles are on the car.
Good luck,
Will aka The Swami
