Apologies for the long post but I thought sharing my experiences after six months or so of use might help others. Firstly, the concept is great! I have a Synology NAS that holds all of our music, and with one of these Denons in the kitchen and one in the living room the convenience is great. The Denons are really flaky (probably the best way of describing them), although of course the set up may have something to contribute to the issues they show (I mean that I haven't tried another media server, or other media server software on my NAS, so this a "out of the box, over wifi with a Synology NAS and Q Accoustic speakers review"). Also I have a mixture of FLAC ripped and MP3 etc. 1. Tracks will stop playing at any time. Not a buffering issue as it never resumes, or (more often) just jumps to the next track. When it stops and doesn't jump to the next track then the display is just blank. 2. Tracks will repeat for no obvious reason. (no, not the Repeat function set!) 3. A track will get "stuck" as the only track it will play and next time you switch it on again that track keeps playing whatever you choose. The only solution to that is a hard reboot. 4. They will lose connection with the network "no connection available" very often and the only solution is a hard reboot again. Running through setup doesn't re-acquire the network. (Network is wireless, SKY router in a pretty small house - Denons are less than 20 feet from the router). 5. Not really an issue as such but something to be aware of: when you are using the Android app to control them then the majority of the controls on the unit and remote are unavailable. 6. Sound quality: I appreciate this is going to be subjective, and obviously affected by the speakers you have, and the fact that this is not high-end audiophile equipment anyway. But the sound overall is very bland and uninvolving. There is no soundscape painted in front of you (I have tried classical, rock, metal, pop and nothing creates a sound picture in between the speakers). 7. You really will have to use them with the app as trying to use the small LCD display to scroll through hundreds of albums (with no search, or "jump to" a letter of the alphabet) is useless. 8. However, the Denon app is really flaky too: it hangs a lot (Ok, could be my phone but it is a brand new HTC Desire 510). 9. The Denon app regularly fails to find the Denons and/or the server. (I tried changing the setting on the server to broadcast itself every 5 seconds but it made no difference). Refreshing does nothing. Restarting the app does nothing. The only "solution" I have found is to give up and go and do something else instead! 10. There are many third-party apps for Android but I have not found one that doesn't have some annoyance or other, or just plain doesn't work. There are a few apps for Windows and they have their issues too. 11. They often miss the first second or so of each track. Don't know why, it's like it buffers it, starts playing and then (perhaps) brings up the volume. Annoying. 12. It will often cut off the end of a track and move to the next, usually just a few seconds before the end - weird, and annoying. 13. Time lag on the remote is awful! You press a button (with the remote a foot away from the unit and pointing right at it) and nothing happens. You push again, you push again. Of course then it executes all of the commands! 14. When you change the volume the volume slider display sometimes gets "stuck" on the screen, Powering off is the only solution. I had a mate round for an evening and so an opportunity to "show off" my new tech. It was an embarrassing litany of "oh, why is it playing that? oh why is it playing that AGAIN? Oh it's locked up, sorry I'll have to reboot it and re-find the network server, oh wait, let me reboot my phone, oh that hasn't helped. Shall we watch tv?". All we wanted to do was sit down and listen to an album in its entirety! If you feel the urge to hear a bit of music and grab the remote/app you may have lost interest (or forgotten what it was you wanted to listen to!) by the time you actually get to play the thing!!!