Does the X800M2 play multi-channel via the USB port? I see that it will play FLAC, DSF, DFF, WAV etc.Another vote for the UBP-X800M2. It’s the only player I use and it plays DVD-Audio, Blu-ray audio, SACD and ripped files perfectly. The Dolby Vision toggle is a little annoying and it also shuts off after 20 minutes of inactivity, something which you cannot change. Another inconvenience is there’s no gapless playback for ripped files and you can’t skip between chapters on .mkv files. But the pros far outweigh the cons!
(It annoys me that my Marantz AVR will play only 2-channel sources via the USB. At least that's what the manual says. I use my Oppo, so no big deal.)