+1 on the B&O
Just like my pal in Alabama, I did not get the B&O and regret it every day. I ordered my car in June of 2011 for a Sept 2011 delivery so there wasn't one made yet that I could listen to.
I've just test driven a 2013 Grand Coupe with the active seats. I'd pay NOT to have them. Just like sitting on a wooden bench waiting for a bus. No way I could like them better than the standard Nappa seats in my 2012 coupe.
Be sure you sit in the "active" seats before you buy them. I vote big time for the B&O. Who needs your butt jiggled by a hard seat anyway?
2013 650iGC M Sport Black Sapphire Metallic
2012 650i Black Sapphire Metallic
2011 535i Sport Black Sapphire Metallic-Sold
2008 650i Space Grey-Sold
2007 335i Space Grey Coupe-Sold