Got one of the receivers and subscribed because I use my Dads a lot and he constantly gets annoyed by it. My Si didn't come with XM because of the base model. Anyway to those that have ever used it or ever subscribed at all... If I was to ever want it cancelled I don't think it will be simply a call as I've read from others. Mostly have used it on my stereo in my room thanks to a home kit.