I signed up for Spotify when they first started and used it briefly. Really didn’t like it and it doesn’t offer me anything I don’t already use between Amazon Prime, Google Play Music and my 30,000 mp3 library. That having been said I can see where it could be useful to folks.
I was given yet another reason to not use their service. Recently (like as soon as they were released) I picked up a Chromecast 2015 and Chromecast Audio. For the price the Chromecast Audio is awesome. Unfortunately even though Spotify has added Chromecast support, they are treating the Chromecast Audio differently and you have to be a premium user in order to cast to it.
Just weird that they are treating the devices differently.