Some Series X impressions:
The system:-OS system is near identical to the One, just much snappier due to the hardware.
-Quick Resume is awesome, or at least can be. Not every game works and there are some bugs. But jumping back into Gears 5 after doing some races in Forza in a matter of seconds is very neat, especially since you can continue right where you left the game.
-The controller is highly similar to the One's, but it feels significantly more premium.
The games I tried:-Gears Tactics is a very nice game, I think it is an addictive game with a high pacing for it's genre. Suitable for strategy casuals like me. It really feels like Gears of War.
-Forza Horizon 3 remains amazing, One X enhancements make it look much tighter.
-Red Dead Redemption One X enhanced looks great, the game has aged very well. The jump from the 360's 720p/PS3's bad 640p to downsampled 1080p from 4k is very significant.
https://www.youtube.com/watch?v=lK-eya5qGUUOffcourse none of these games are remotely as impressive as, say, The Last of Us II, so true next gen console experiences will have to follow later. Hopefully Cyberpunk next month delivers.
I am considering starting a new No Man's Sky save though, because that is something the Series X will do vastly better than my PS4pro. Maybe I will boost my new save by going online with both and just hand over a bunch of expensive shit.