The thing i'm finding so annoying is the complexity that seems involved to perform an upgrade. All the previous cars I have had have been pretty easy to whack in an amp and sub and upgrade the speakers...
I completely agree though, the car itself is like nothing I have ever driven before and after only 4 days driving the car I am a converted BMW driver and will hopefully never touch another manufacturer again! Hat's off to the production of the vehicle but i'll keep my hat on when the sound system is mentioned.
I have recently spent £800 buying a Harman Kardon AVR and surround sound for my house - it sounds phenomenal - shame I cant just stick it in my car!