I haven’t compared the N15D with anything other than my CD player, so I don’t think I am really the best person to ask. All I would say is that I am more than happy with it together with Roon. It serves the purpose I bought it for, allowing me to play my music (CDs burned to FLAC files) stored on a NAS at a sound quality that is as good as that which I was getting from my CD player.
I should add on re reading the thread, that I have had no issues with Roon losing control of the device, nor any other issues to speak of.