I had been on XM2 then CC6. After 20k km XM2 is noisy and hard.

CC6 is good, much more comfortable and quieter. I didn't experienced any grip problem also. 110km/h cornering on highway during heavy rain also ok. Maybe my car is heavy, 1200kg Prius C.

Just my tires lifespan generally short, around 40k km only reach minimum thread. Can't imagine you guys with 100k km. Wow