I got one of these things. I haven't seen much in the way of its power yet, but it's... nice.
Like I have 2 months of their game pass, and so I've played Gears of War 4 which is enhanced in 4K. Looks pretty good. Not the best game, but fun enough.
I like Playstation's exclusives more. I would have bought a PS4 Pro, but I wanted something that would play 4K blu-ray discs. So Sony screwed themselves out of a sale there.
The other exclusive game I've played is Quantum Break. This is kind of cool. Very cinematic, and with a fun time-bending mechanic which is fun.
I want to get something new to be able to see what the hardware can really do, but I spent so much on the system I won't be buying any games for a while now.