It looks very cool, but they definitely moved & rotated slowly in the video. Hopefully they can keep the motion tracking processing latency low enough to not cause nausea.
The other thing is the demo environment is very dark. All the lamps are dim and angled towards the walls.
But Magic Leap's display has a physically spinning component. I wonder if you move quickly there is a gyroscopic precesion effect that distorts the display...
At least that's what some of their patents describe.