i had XM, it was decent......alot better than regular radio, but the day that Howard announced he was goin to Sirius, i cancel'd my subscription and got Sirius........and the programing is 10x better IMO
it cost the same monthly, XM has better equipment right now, but Sirius has new recievers comin out every month so itz only a matter of time before they overtake em on that too........go wit Sirius you wont be sorry