I switched from MOG to Spotify now that they have a Linux client in beta. I have to say, the music discovery and friend integration is much better and I have *WAY* more friends on Spotify. MOG’s web client worked terribly on Linux and most other platforms from what I read. Streaming would constantly choke and stutter. I ended up mostly listening on my Android phone, which is OK but isn’t really the service I was paying for. Now that I have a working desktop client I find myself listening to a lot more tunes.
Of course, I wish the desktop client was Open Source but at least there is Linux support and at least it works and works well!