As I just surpassed 100 hours of use on this new unit, I first want to reiterate the excellent video and audio quality I am experiencing from all video source resolutions and in both digital and analog audio modes. BRAVO!
Now, I would like to report my two problems, as follows:
The first is a video issue. The "AUTO" setting within the VIDEO SETUP submenu of the SETUP MENU does not work properly for me. I beleive this may be a known issue to Lenbrook (NAD Support). This setting should automatically retieve the native resolution parameters from the video display attached to the Main HDMI output and apply it to the video processor settings. My display is a Pioneer PRO-101FD Signature Elite plasma which has a native resolution of 1080p/24. This plasma monitor also has a handy button on its' remote control which momentarily displays the resolution of the video signal it is receiving. It only shows the M15HD sending a 1080i/60 output. This makes a world of difference. (I've read anecdotes for several years how expensive video displays have superior scalers to the majority of sources so it is preferable to let them do the scaling. I've never found this to be the case with my $5500 plasma monitor.) As the DVDO Edge (which I liberated from my home theater when I installed the M15HD) has the same "AUTO" feature in its' menu, and succeeds in picking up the proper parameter from this same display, I beleive the M15HD to need an engineering tweak.
That said, the simple workaround is to toggle the unit out of "AUTO" and just specify your display's native resoultion. Fine. Just note that to save this information, you have to press the remote control's "right arrow" button on the "SAVE" option. (This is the only non-intuitive setting I've found so far in the Setup Menu structure ---- but is explained properly in the manual.)
The second problem is an audio issue. This is a serious, material problem. When I turn the unit on from stand-by it, of course, selects the same input I was using when I last turned the unit off. The problem is, with all inputs having a digital audio component, the unit SOMETIMES will not lock onto the audio signal (I get no sound.). I have to turn the power to the M15HD off and on a second time to lock onto the signal. (Turning the source component off and on does not help.) For example, if I was watching a Cablevision station when I last turned the unit off, when I turn it on again later in the day, the M15HD sends a proper video feed to my display, but no audio signal to my multi-channel amplifier. If I cycle the M15HD's power off and on, I now get both proper video and audio signals. Perhaps my unit is defective. Otherwise, this is a critical engineering flaw. Please report any similar experiences on this thread, as this is cause to replace or repair my unit.