I know I am in the minority based on what I read on the various boards, but I am very satisfied with both the sound system in my C6, and with XM radio. Perhaps it's because I grew up listening to AM radio, 45s and LPs, and 4 track tapes, I don't know.
I think it is wrong to expect concert hall sound quality in a two door sports car-too many variables for any sound system to really control. I enjoy the variety I can get ftom the XM, the lack of commercials, and the ability to have balanced sound while switching from AM to FM to XM to CDs. (I am not thump-mobile kind of person so the ability to change the rythm of my heartbeat with my car radio it not a pre-requisite to judging whether a sound system is good or not).
You may consider me an old foggie (my wife certainly does not) but I love every minute in my C6 with "the radio blastin going crusin just as fast as we can now!":buhbye: