On OneX it runs overall well, though there are definitely some chunky parts. As the game has gone on longer, I've gotten a few glitches, but nothing too serious. I would say the loading times compared to PC are looooooong though.
On PC, it runs great, and I think it is definitely the way to play, even vs OneX. But, even though the GamePass and Store pages list it as supporting Xbox Live Cloud Save, Xbox Live Achievements, and Play Anywhere, I saw no evidence of any of those things. The PC version didn't show any achievements, and it didn't sync my saves. Also maybe related, if I open the Xbox Console Companion, it only tracks my "last played" date for the Xbox version.
I tried reporting a bug on the Subnautica forums (
https://forums.unknownworlds.com/di...oud-saves-and-achievements-not-working#latest), but it got only 1 reply of another player reporting the same thing, nothing from Unknown Worlds.
I tried their official Discord channel as well, but there were no devs, only other players. I'm not really sure what the "right" way is to raise the issue / question with them, if anyone knows of a better channel I'd love to hear about it.