All in one types appeal, but better to avoid. SQ does get impacted. Same happened to me initially and i too was liking that idea, however not any more. I had checked 603 but sq was ok, not that great.
Also remember, networking / shariing solutions appeal but they rarely work smoothly due to network issues. U will experience glitches / hanging / buffering etc and not let you enjoy music. Also in such cases your focus will get diverted to selecting the song via the limited display rather than playing and enjoying.
This actually is an important point in my opinion. I have felt at a certain point you do get involved to such an extent in troubleshooting and keeping the system going that it can ruin the pleasure of music. Although with these devices one expects things to be much smoother than before.