A colleague got Sirius and loves it, not only because of the selection but because it records playlists, so he knows he always has something he wants to listen to in his car. I guess it's a big like Tivo in that respect.

Big difference between Sirius and XM however. If you're into NPR, get Sirius. If you're into Nascar, get XM. You can't get one on the other.