The mobile app is more annoying with free because you can't play an album or playlist straight, you have to use shuffle, so if it's a case of "Oh hey have you heard this song check it out" it's pretty useless. You can still skip but there's a limited number.
On the other hand used it for a block party so choose one of the summer party playlists and felt like a hero after getting a number of compliments for a great selection of music
Will probably get premium.