Got one near release day.
Can verify that you will fall.

destroy the room.

Caused discomfort in 60% of its users. Nausea, headaches, vertigo, vomiting, etc.
Sounds like fun.

the more I kept going back for more, the less the motion sickness became, until three or four days into it, I had no more motion sickness, and haven't had any since. I think it's a lot like getting your "sea legs" on a boat. Sea sickness usually passes a couple days into a voyage, and VR motion sickness seems to work the same way. At least it did for me.

Your eyes are telling you that you're moving, but your inner ear is saying "Nuh-uh. We're standing still."

So your brain defaults to the setting it does when there's a difference in inputs: It thinks you might be poisoned and wants to expel whatever's in your stomach. (Because clearly that's where the poison is, according to your brain.)

If you're sitting down, that effect is lessened.

In Fallout 4 VR, there's several ways to navigate: teleport to a location or use the joysticks to move. You can switch them pretty much on the fly, and it's noticeable to me how much more queasy I get when I use the controller's thumbsticks.

In a game like Elite Dangerous, I'm sitting down, so there's almost no nausea (Unless there's graphical lag.)

There is vertigo, though. When you're landing on a planet and your ship has glass panels in the floor of the cockpit, it looks like it's a loooooooooong way down. (But it still looks amazing)

create no problems at all. I can play Beat Saber for hours with no motion sickness or loss of balance. (Which is saying something for an old fart like me.)