I canceled my SiriusXM sub a couple months after the merger. I was an XM subscriber that was "merged in" and when the merger finished, one of the big reasons why I was an XM subscriber (no talking DJ's on the channels I listened to) vanished and suddenly all the old channels I listened to had talking DJ's everywhere.
I had to wait a couple months to cancel because of a weird clause requiring some amount of "sub time" before one could get a pro-rata refund in the agreement.
Cancellation had to be by phone, and the SiriusXM person went so far as to offer a full year of free service to keep me on board. She was quite shocked when I told her, no, not even a free year will keep me as a subscriber. I also asked her to be sure to tell her managers that the reason why they lost a sub was adding talking DJ's to channels that previously had none.
I switched to a commercial free, DJ free mp3 player for my commute, and eventually the "mp3 player" was replaced by my cell phone.