My two cents, I have a B9 A4 loaner at the moment, 2.0Tdi Sline 190 S-tronic.
The sound system is woeful compared to the B8.5 with B&O, (no where near as good as my 2009 B8 either) well worth the upgrade money in my eyes, I have played with all the settings, tried my SD card quality music and it...