Ceramic vs semi mettalic pads

Ceramic: These are composed of ceramic fibers, nonferrous filler materials, bonding agents, and possibly small amounts of metal. Lighter in color and more expensive than other brake pads, ceramic pads are
cleaner and quieter, and offer excellent braking characteristics without wearing down the rotors.
I have heard from some other sources (distributors for performance car parts) that the clients that typically buy speed parts say that the ceramic pads actually wear the rotors worse than semi-mettallic and have worse brake fade under heavy use conditions. They say the brake dust just looks like it is less since the dust is a lighter color.
Does anyone have any experiance on the 2000 a4 1.8T (non quattro) with vented/slotted rotors between using ceramic or semi-mettalic pads?

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