I finally got around to installing a docking cradle for my Sirius Brix Streamer Replay in my new truck. The truck also has XM which is currently on a 3-month trial. I plan on letting the trial lapse when its up, and using the Sirius radio which has a lifetime sub on it. To me the audio quality sounded the same on those channels which were duplicated on Sirius and XM. Interestingly, I found the Sirius audio lagged the XM audio by about 4-5 seconds.