Canceled mine after ad-free stopped working on YouTube Kids of all things (on ShieldTV). Was probably a bug, but with practically no customer service options, no real solutions besides cancel.

I was also a holdover from a paying Play Music subscriber, and this was shortly after the pita music switchover to youtube, so it was a last straw.

Halfway ready to fist-fight whichever exec drove the death of Play Music. It was a very, very good application, which could have continued to function as such when the platform ended, but they wouldn't even let us have that. I still have them and refuse to uninstall.