I noticed a difference going from newer (couple years old) rubber to the poly suspension, but then I am into "spirited driving" in the first place. Although I prefer the oem rubber for overall ride quality. Also the lower control arm bushings in poly are crap, and even my polygraphites squeek slightly (not enough to bother me and I dont drive it in the winter when the cold seems to make it worse). I would stick to rubber for overall street use and leave the polies to the guys who are really into slalom, autocross, or maybe even drifting.