I didn't bother getting the upgraded ASS or B+O sound systems nor try the standard one, as coming from a focus the standard sound system in them was fine for me. I love electro house and trance music and in the Ford you couldn't get it anywhere near full tilt because it was too loud as standard. So didn't give the sound system in the Audi a second thought........ Bit of a mistake on my part in hindsight!
The standard system is fine, even for dance music, with a bit extra boost on the bass and plenty of treble I'm quite satisfied with the quality of the audio. It's just out isn't all that loud even on 34. Granted it doesn't have the pounding bass of a sub but it's acceptable, just wish it was louder.
So what I'm trying to say is. For anyone in two minds about upgrading their sound system.... Without a shadow of a doubt.... DO IT!