As stated above, XM playlist is deeper. To me, that means listening to pure crap half the time. I have had both and much prefer Sirius. Those who complain about the sound quality are probably using the FM modulator. (antenna) Use the adapter and go straight to the head unit if you have aux. input. VERY close to CD. BEWARE of the lifetime deal....it is for the lifetime of the reciever! When your radio dies your subscription dies with it.
