Ordered one of these, a Sony UBP-X500 UHD Blu-Ray player.
Now, I already have an external UHD BD-R drive for my PC, one I paid to have imported from Japan. However, thanks to NVIDIA and stupid DRM, it's an absolute ballache to actually watch any UHD content on the PC as it only works with Intel graphics and there's always a driver issue that needs resolving before it works.
This will sit where my Xbox One sits now and it had damn well make the experience a lot better. It's the cheapest and most basic of the X series players, without any smart features at all. I'm connecting it to a smart TV that also has a smart cable STB and a PC connected, so I didn't need to pay for any of those features. I just got Blue Planet II and Planet Earth II to add to my other UHD stuff so I'm looking forward to trying it.
I'll be selling the BD-R drive, it's a Pioneer BDR-XD06J-UHD and is a great drive, if a bit noisy for watching films. It's just the software that lets it down. If anyone is interested in it for disc creation or data storage on Blu-Ray discs (it'll write 128GB BD-QL discs) then let me know or it'll probably go on eBay.