Apparently there's a bulletin for distored sound on B&O that can be resolved by a software update.
the link is for the audi US, but there's probably one out there for europe too.
EDIT: ignore me, that's for the b9 a5
I did the same thing in November. Mainly because I wanted a smoother ride and nicer up to date interior.
It more than meets those requirements.
why are you thinking of switching to an S5? what do you want out of it? if you have answers to those I can maybe be more specific.
subjective question and I suspect different people will give you different answers.
I personally wouldn't worry about it too much. just don't take the ****. make sure the engine is warm and don't do it several times in a row.
the car is smart and has a million different sensors to detect when...