Looks like they recently turned their first quarterly profit.
I love Pandora. It's the app that's being run the most on all my machines (laptop/desktop/android). In my eyes it's completely overpowered things like satellite radio.
Google Music is nice, too, but only if you have a large existing library of music, and in my recent experience it's been very slow to jump from one song to the other.
I used to listen to Pandora for ~50 hours a month, but since they added in comedy show clips, my usage has jumped up quite dramatically. I absolutely love it.