I love the RS4 - but the price of the composite disks is amazing
Yebut, they last 5 times as long as conventional discs. And standard discs and pads on an RS4 will be around £1000 for the parts, and some people have reported wearing them out after 4½-5k miles! So it is 6 of one, or half a dozen of the other, in terms of price - but that excludes the drool factor of the ceramics, and also the mind-blowing performance advantage too!

And the sound that the engine makes........mmmmmm 
Yup, it even scares Germans!

Talking of road trips in a S4 -the photos in the link are quite funny - if you like Nagaro blue (appologies to folks how saw it the last time I posted the link)
http://forums.vwvortex.com/zerothread?id=2918517
Vortex is down at the mo, but if that was where two kids taped up a black B5 S4 and drove from one side of the US to the other, yes, very funnuy and interesting.
Apparently, it is quite common for them to tape the front ends of their motors, probably a cheaper version of the "car bra" principle.