I did not have a good experience with my C6 when the free XM service was for 3months. Started getting "nag" calls after two weeks of ownership. They needed my credit card in order to "set up" my account. I did not give it and dropped XM after the 3 months was over. Far too many drop outs on clear roads with no obstructions and too much money.
From what I've read, Sirius has taken over and the service has not gotten any better. My Stingray is due with a month so it will be interesting to see how they try to pressure me into a longer contact once the free period is over. I'm betting they'll be nagging me within a week or two of putting the car on the road. I'll update this post in the future.
