Im not sure why you have Sirius, but I'm in the same boat. I am leaning away from Sirius with what is appearing to be the retiring of Howard. Although with Bubba building a larger studio, they both may be going to podcast, just like adam. Which there are apps to download podcasts to your phone already. For me I think Sirius wore out its welcome by screwing with Bubba and Howard. Who wants to listen to Martha Stewart and Oprah anyway?!!!
I have Sirius because I don't like fiddling with the radio on longer road trips and I live in a mountainous area where "up" is usually clear, but line of sight to terrestrial stations is obscured. I like to be able to put on a station and listen without commercials, fading, etc. I was never a big fan of Howard, but I mostly listen to music, BBC News, the Comedy stations, and Football when the season is appropriate.
I'm willing to try switching over to a new service or getting the android app when it's released ( SIRIUS|XM on Android ).
I suppose it's different strokes, but I don't own much music thus making that cost too high and I've never had a smart phone before to stream music from free services, so I have to do a bit of testing before I get rid of my tried and true Sirius solution.