Thank you all so very much for your input.
RPiM5, im not getting another M5, Im actually going to order an M6 coupe and have been going back and forth on whether or not to get the B&O.
I'm not interested in telling my friends how much the upgrade cost, nor am I interested in what the system looks like. Unfortunately, I am not so thrilled with the regular sounds system in my M5 F10 (but also have previously heard mixed reviews on the B&O) which is why I am asking the members of this forum for their opinion. Unfortunately I've never sat in the E60, but i've heard some amazing things about V10 music
Again, thank you all for your comments!