Wow, I didn't get to try CC6. I used to have CC5, dry was ok... But wet it was really shit. The only tires that is good at wet at that time was ATM1 plus it was quiet as well. That's how I end up using ATM, as my friend was using XM2. It was ok, good but not better than ATM1 at that time. XM2+ the noise level quieter than XM2. According to media post online by a lot of sites,, it seems there is improvement... But hey you are paying extra for XM2+for high milage durability (should last upto 100k km or more) it's bound to be less performance than ATM2 (60k I'm will start to be careful)

I'm still using my ATM2, 10k km in it's going good for me. It grips well when cornering into those clover leaf highway merge/exit.  Mind you I'm driving Almera, it's not good in handling.