I used to absolutely love Sirius (before the merger). But when they were doing the free broadcast last year, I listened to it for a while and realized it just wasn't as good as I remember it. I don't need eleventy-billion sports stations, nor do I need even more 'Top 40' pop stations. The rock stations are very repetitive as said above, and searching through all the channels is frankly a pain in the ass, at least with the Caliber's primitive head unit.
Not to mention the fact that I get enough junk mail as it is; I don't need them sending me subscription offers every time I turn the radio on. Frankly, it kind of creeps me out when some company sends me a letter with my full name, address, and VIN just because I hit the wrong button while driving.