Well it was very impressive.
First the security around the demo is really incredible. You have to leave all your devices, bags, watches etc in a locker. There is staff in front of every door. They do not answer any question about SDK, device availability, price point, or anything really.
But you get to try the device.
I had a scenario where I was an architect and able to see and modify a 3d model of a building. Using a mouse in 3D is surprisingly easy.