Happy I did the B&O no rattles and no Nav issues (yet?) although I agree not as good as the 2012 Audi I rented outside of Munich. Audi Nav was much slower though.
F10 30 Jahre M5/F80 30 Jahre M3
F82 M4 GTS
E36 M3 with S54 Swap/F22 M235 Dinan Stage 4
X15 X5 3.5i/03 Cooper S (Maxi Tuned +50bhp)
60 Impala (43k orig mi)