I just got my PSS put on yesterday, i had kumho xs rears and the original michelin runflats on the front, and i am shocked at the difference in ride quality! i feel like i went from wooden wheels to a cadillac. i no longer need to wear a mouth piece to prevent my teeth from shattering when i go over a manhole cover. i can not stress how happy i am with these tires and the way they ride! Kudos to DC Performance for taking care of me!