Well, not on my GS but on my wife's '98 Audi A6. Ordered from Tirerack and just got done driving back from an Audi specialty shop in PA.

I am seriously looking at getting these in my GS. My TRD pads are nearly dead so I am going to replace them early with the EBC pads. Hopefully I can still use the TRD rotors.

My early impressions of the EBC is that they are very similar to the TRD pads and rotors. They do seem to make a bit more sound when braking. I can actually hear a humming sound, which I don't hear in my GS. Looking forward to seeing the difference with dust as well.

Thought some people might be interested.