I plan to use my 520 primarily for music (FM radio, internet radio); with some audiobook and library use. I'd use it for other things, but the appstore is too weak to support those uses (OTR, remote control, Prime Music, Prime Video, etc).
Books- Audible
- Downpour
- Kindle
- OverDrive
Music- iHeartRadio
- Pandora
- Slacker Radio
- TuneIn Radio
Entertainment- Angry Birds
- Mahjong
- Netflix
- etc