I have been a huge Rdio fan for awhile and after playing with Spotify I have come to the conclusion that Spotify is great if you don't want to pay, if you want to pay then Rdio is much better because of the method in which it presents new music to you. I get the feeling in 6 months the front page of Spotify will be new albums which compete for attention space on your monitor by how much money is put behind them - pushing them into your view, where as Rdio (because it is paid for) will continue to be a screen full of albums liked by your friends or people you follow. I much prefer the later, however the former isn't a bad option if you don't want to pay for anything.