John...Just as an FYI..the M
John...Just as an FYI..the M series does use run flats. I bout my new M series in August and it has run flats on it.
Regardless...They are pricey, not quite as a smooth ride. No 50 repair job on these babies either. But it is a personal choice. I like them. Don't have to worry about changing a tire on a busy highway and when they blow you don't even feel it...I actually blew one last night. Yes my wallet will be lighter but for me they are perfect.