Like mentioned earlier, Sirius has almost all sports compared to XM.
+1 on getting Sirius for Stern, but listening to other channels is well worth the money. Especially since we have 4 in my family. I got a 12 month subscription and its only another $7 a month/new radio with a limit of 3 more getting added. My bro and dad each have one, and I got one hard wired in the SS and another for home and the beater.
I love mine and so does my family.
Check out the new stations added this past week too.