I'm running a Sonos as well as a BDP-2 into my BDA-2. I know this may sound... goofy, but the BDP-2 makes music sound more natural... more like music. The Sonos gets the job done and works great for ambient music when i want control from a room or two away. But for any time I sit down and listen/enjoy music, the BDP-2 makes all the difference in the world. It makes me tap my toes, literally. The Sonos does no such thing. And that's using identical FLAC files from my server. When I use streaming services (Rhapsody, Last.fm, MOG, etc.), the quality goes down due to compression.