I tried it
And thought it was pretty good, add to library works well and the 'radio' stuff is OK too. I already used Google Music so it a natural step.
For £8 you get offline access to all the music that you have added to your library in the mobile and desktop clients. This is slightly cheaper than Spotify's service.
Need a nice way of integrating this into my Hi-Fi. Simplest is PC with browser -> USB DAC (HRT Music Streamer II) -> Amp. But would be nice to use Android as remote control.