Ok, I got the Premium stereo upgrade with the Bose system in my C230. I wasn't overly impressed with it though. It has great clarity but poor range. I've tried all kinds of music but I just can't get the bass to sound really full. I'm not trying to rattle people's windows or anything but it's just not quite as I expected. Anyway, when I took my car in for some work, they gave me a loaner with the regular non-Bose stereo in it. I could hear no difference between that and my Bose. Also, I can hear NOTHING (other than air) coming out of my center-fill speaker. Shouldn't I be able to hear something? Anyway, my question is: Has anyone listened to both systems and was there a noticeable difference? Also, shouldn't I be able to hear SOMETHING in the center fill speaker?