Slacker doesn't work anywhere near as well as it used to. I often get "pauses" for no reason and the tell it to "Play Eye of the Tiger" barely works anymore. Songs that I've been able to tell it to play numerous times it can no longer find. Yet I will hear the song playing randomly, so it's obviously still within the Slacker system.
Also, because of the low bitrate of Slacker (Tesla won't allow the high quality transmission) the audio quality really isn't that great. And finally, I spend A LOT of time in the car, and although Slacker isn't anywhere near as bad as Sirius/XM, I'm getting tired of hearing the same songs over and over.