O O O O'reilly.
I had premium for about a year then let it go because I was enjoying Songza most of the time. The free version of Spotify isn't bad but the shuffle play on the phone and tablet can be annoying at times when you want to listen to an album straight through. Also if you have a playlist with only a few songs they throw in a bunch of suggested songs to the shuffle play. Small complaints for what you get for free.
Creating playlists can be work. There are a bunch of playlists out there that you can subscribe/follow that aren't bad. One feature that has been mentioned is on desktop version as you are listening to albums or radio any song you like you can drag over to a playlist or create a new one or just star it. This makes it real easy to build playlists over time, especially if you run Spotify in the background while doing other stuff online.
If you link Spotify to your Facebook account does it spam your FB timeline every time you play a song? I'd rather not have that info out in the public sometimes