But there are some third party applications like amarok and some android players that work fine playing songs from mp3tunes cloud. I think the service it's ok.

Any updates of the script? I have installed it and I can´t play songs from the mp3tunes cloud. I think this is a very important feature for MediaMonkey because provide a similar functionality than Spotify player with the same songs and playlist in every pc you use (for example at home and at work) ...