Just tried it, here is my feedback so far:
it has a way bigger FOV - I fly helis a lot, and I fell in love...
it's connecting through a cable/air link - so expect some compression artifacts - if you have a powerful GPU, won't be an issue, I managed to get a really good compromise with my 3080Ti with cable connection and a fair* with Airlink
you need to charge the headset somehow, USB-C port of your motherboard won't be enough (see a few posts above)
the picture clarity is about 20%-30% more "clearer"**, depending on your settings.
* - you might not be able to do dogfight with these settings due to the compression artifacts, but still playable
** - Feels a bit weird at first, but you get used to it after a few hours. Hard to describe, but it's more "pixelated"/ "blurry", but still, you can read every label way easier than with Rift S with 1.7PD!
I just went back to Rift S to actually see the difference and the readability and the FOV are the "topmost perceptible" things.
Also, maybe it's me, but it's basically stutter-free. If the FPS counter says it's 40fps, then it's 40fps Tried the Shooting Range mission on the Syria map with Apache and shot almost all targets (so loads of smoke) - and there wasn't even a glitch of stutter, even flying through an explosion/smoke