I think it's more about the UI - which looks near-identical to Spotify's.
It's developed by the same author of original uTorrent, Ludvig Strigeu.
Nowadays, Spotify kinda bloats with cef and funny feeling HTML5 UI.
Trivia: Ludvig Strigeus also developed Spotiamp http://news.spotify.com/us/2013/12/20/spotiamp-long-live-the...
*Ok it's still an epic task :)
Holy crap, that is quite a claim!
At the moment I have been using Tidal on a trial and I just keep finding so many small features I miss from Rdio. The only thing I like about Tidal is the Lossless option.
I'm in Canada so I didn't realize Deezer wasn't available in the USA.
As far as I know. Deezer is available almost everywhere except the US and Japan. I hope they figure it out soon. I"m glad to hear that you like it.