I like runflats. My 335is has the Michelin PS2 ZP's and they ride fine and are not noisy. People who hate runflats seem to forget the many advantages. My '06 Z4 with the sport package rode harshly but BMW has adjusted the suspension on the 2011s. My Z4 rides fine.
2012 328i Coupe
2013 650i Coupe ( retired for Porsche 911 )