Went to the Gadget Show Live today, and i was pleased to find that there were a few Oculus Rift's dotted around (not in their own stall, but a few shittier stall had demo units to draw people in). We went and queued (for 45 minutes) at Protect Your Bubble, who had one you could have a go on.
First off, it was a DV1, so it still had loads of motion blur, and the screens were low quality. Also, i left my glasses on, and they got crushed down onto my nose, so for the first 30 seconds of the demo i was just basically in pain. However they were still really cool. So much more immersive that i thought they would be.
When i first saw the demo on the big screen i was a bit disappointed; it was an on rails roller coaster thing through a ravine with trees and old houses etc in the chasm. It looked really lame. However, once you get the Rift on, it becomes amazing, you get a real sense of depth (almost vertigo), and the whole level just becomes incredible. You find yourself looking around trying to see everything; things that looked really boring when you saw it on the screen you really want to check out through the Rift.
I don't really care about Facebook buying Oculus, i think they'll be fine. As soon as the consumer version comes out i imagine i'll be getting one regardless.