Michelin XM2+ has one advantage which is long mileage. They last very long. Perfomance wise it is quite bad especially in terms of grip. Also as they get older they get really hard and noisy.

For some sizes they are not worth the money as esentially you are paying for the premium Michelin brand.

I have nothing good to say about CC6. They are quiet with terrible dry and wet grip. If you value safety avoid them. Very prone to aquaplaning even at the smalest puddle of standing water.