Either the Sony X800M2 or the X1100es player will play with precision 4K discs for a lot cheaper than the Reavon UBR-X200.
The Reavon is overpriced. What kind of support will you get if it's defective? That's an important consideration as well.
I have the Sony X800 and it works pretty well
body beads. It also reads SACDs and DVD-A discs. What is noteworthy is that it also performs as well as my OPPO UDP-203.
It's also good to bear in mind that Sony was involved in the development of the 4K disc.