I just re-activated my Sirius just in time for Howard Stern.
I still listen to the XM far more. It's a factory installed unti and the reception is much better.
I enjoy the decade (50s, 60s, 70s and yes the 80s) channels, soul and jazz channels (conservative or not) are not that bad. XM does have a "Beyond Jazz" channel where you will here some of the the more "out" or less traditional stuff.