The SQ of SiriusXM is just awful. That doesn't keep me from subscribing - just for the car - but it's surely not because of the SQ, which seems to only be getting worse, not better. My iPod sounds better. Much better. Really.
Surprising Audio Quality
I have been listening to radio via satellite for a couple of years. I have the Burmeister system in my car....just happened to switch to regular FM radio (kbaq in Arizona) and shocked to hear it much better in audiophile terms than is the fancy satellite.... interesting....