I have them on my car, The cars done 57k and the discs look like new, there's no wear lip like you get on steel discs and like you say they are meant to be good for 100K
The stopping performance is impressive to say the least, easily will have your passengers complaining at the deceleration. although I have not driven an S8 with the steel discs for comparison.
Yes they squeak first thing when cold, but on my car its only when I back out of the driveway 20 feet later and the squeak is gone.
One thing I don't like about them is the feeling when they are wet, few occasions where I have been driving in heavy rain and went to use the brakes, it feels like they are doing very little but it only takes a slight squeeze harder on the pedal and the waters burnt off and they are back to normal.
As for accidental damage removing wheels, well you would need to be a complete klutz to manage that as there is a shroud all the way round the disc, and if you use the locating bolts like your meant too then the discs wont come to any harm.
As for replacement costs yes indeed they are stupidly expensive, but here's hoping that I won't need to replace anytime soon and if they don't come down in price to a sensible level by the time I need too then I would look into alternatives like replacing the discs with steel ones on ally hubs.
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