I thought GM owns Delphi, and since Delphi manufactuers XM radios I just put two and two together. I do know Delphi supplies GM with parts, so there is a relatsionship between GM and XM. Therefore I will not buy anything related to GM.
If XM is not a GM company, then why are XM radios only offered in every company vehicle GM owns. No other car manufactuer that I know of offers XM in their vehicles.

I own several sirius systems, and they are all the Bees Knees!!! Though I have to say Howard Stern has lost his appeal. I've been a fan of his since I was 9 yrs old, but lately he's just boring. Not to mention his shows are becoming very homosexual, I think he's trying too hard to shock people now that I just lost interest. Otherwise I love sirius, They just added the Playboy channel the other day too, wooohooo!