I can say that even with 20 in P Zero RFT (on 405M wheels), ride quality is more than acceptable for me (sporty feelin for sure, but really not that much different than my e46 325i, which surprised me) though noise is more than I expected for a BMW (and I understand that will only get worse). Durability may also be an issue as I already have noticed some damage from non aggressive driving during the breakin period.
So far, so good, but only time will tell.
2013 F30 335i 6MT M-Sport - Blk Saph. / Beige Lthr / Wood Tr. - Tech Pk - VSS M-Adp. Susp. M-Perf Stainless Exhaust M-Perf. brakes