sorry for jumping in - I just went through testing a newly acquired network player myself and would like to throw in a few general findings/precautions:
The device I tested is a Denon DNP-F109, which is marketed, it seems, only in europe. It is acclaimed manyfold as a breakthrough device in the netowrk field, because it supposedly is both affordable (< 400 EUR) and capable. So far the theory.
I was particularily interested because it makes the claim of supporting gapless playback - an absolute must if you have live recordings or like to listen to classical concerts. However, I quickly discovered that the UPnP method SetNextAVTransportURI was not supported, and thus gapless was out of question. Heres the corresponding statement from their Q&A:
Please also note that gapless is only possible if you use the media player function of the device, ie an album go directly to the device by remote control, RS-232C / IP control or via a Web interface. If you use the Windows "Play To" - or other media renderer features (Android music streaming, control by DMC, PlugPlayer, Media Connect, etc.) and use the Denon Remote App, gapless is not available.
Note that this holds true for
all Denon devices! Even their own app can't do gapless, neither can stock AirPlay apps. The only way it "works" is when kneeling in front of the built-in display to navigate the media via IR or hardware knobs.
This proves to me that even with supposed "high-end", or at least "HiFi" devices, you have to watch closely what exactly they offer. They often fail miserably on the software side, in particular with UPnP and AirPlay. I have yet to find an affordable player with full gapless over UPnP.
chris