SiriusXM sound quality is pitiful. Regular FM in the car is way better. SiriusXM has a few ads less, but still far from "no ads" and it costs to listen to it. This SiriusXM/Pandora deal seems like two companies with no bright future trying to become one company with bright future except it may not be easy to explain how and why. Many of SiriusXM subscribers are those who were forced an introductory service with a new car and, once that trial period expires and they decide not to continue with paid subscription, are stuck with a button they do not need for the remaining life of the car. And then, there are billing practices...
I am truly glad to hear that you all feel that Sirius' sound quality is awful.  Low bit-rate MP3 (like 64K low) is a good analogy.  I've noticed that stations that have fewer listeners get lower bandwidth, and hence, poorer sound.  The Jazz stations are almost un-listenable, as is the Sixties channel.
I hear that @jafant . I took a beating on their stock when they merged. Management manipulated the stock then looted the company. 


I do enjoy satellite radio in both of our cars.  A friend has one of those home-based receivers and the sound quality is really pitiful for serious listening, OK driving down the highway!