CASCHREIER  Though I love iTunes there are some things that are missing and I found them in Play. Basically I was using play to preview audio, specially FLAC and Monkey's Audio, the interface is OK but I don't get the Queue window, if you want to play something that is in the library you have to drag it to this window because if you doble click something in the library nothing happens.

But what, in my opinion, is the best feature of Play is it's playback audio quality. I guess it has something to do with the 32 bit floating point process, I really don't know... but man compared to iTunes my music has gained more life, better soundstage and the stereo image is wider. So I started to use Play more often just because of this, if someone with a audiophile profile would give a more detailed review about Play's audio quality I would really appreciate it, so I don't think it's my imagination.  
(Version 0.3)