My car was originally equipped with Pirelli P Zero (front : 225/35R20, rear: 255/30R20). The front tyres were too "thin" which made the driving quite uncomfortable.
After changing all the tyres with the PSS (especially up-sizing the front to 235/35R20), I can feel a significant change of comfortableness. The grip seems to improve as well.
One point to note is that the tyres seem to wear off quickly.