Had them on my 991 Turbo S and on my Audi R8. Other than not having to clean off brake dust and better initial bite upon applying brakes, they are totally worthless for street driving (as far as I'm concerned). And then there was the time when i brought my Audi in and they informed me that it was $8K to replace the brakes and rotors ON EACH WHEEL. I recommend putting option money somewhere more important (like leather covered air conditioning vents 