I got the X800M2 for 2 specific reasons: 1-Dolby Vision support and 2-Another backup universal disc player (BD, DVD-V, DVD-A, SACD, DTS-CD, CD) that can also handle a wide variety of file formats via thumb drive.
My older X800 has gotten a bit flaky with some disc playback, especially if I navigate back and forth on a disc or stop on a frame, and it will occasionally freeze up requiring a power cycle to clear. However, I've had no such issues with the X800M2, but it's new. I also have an OPPO 203 which is my default player, an OPPO 103 and a Sony PS5 which can be another backup machine but has some limitations for movie and music playback. Interestingly, I've run across just a couple of 4k discs that will not reliably play on the OPPO 203 but play just fine on both Sonys. Fortunately I have not encountered any BD or DVD that won't play on all of my machines. But given today's media playback complexities, I don't think you can have too many backup options. For the price and functionality, the X800M2 is a bargain.