Got my Oculus Rift Dev Kit 2 today. After many hours of trying to figure out why demos weren't working, I stumbled across the fact that demos made for the Dev Kit 1 will almost certainly not work correctly, if at all. Additionally, I may need to get contacts or something, because my glasses almost entirely kill my depth perception (something I've noticed to a lesser extent even without the rift) and because they're just plain awkward. And because of multiple lenses in a row, ends up giving bad image quality. So if you've got glasses for extreme nearsightedness beyond their 'B' lenses in the rift, you may want to look into alternatives if you want to pick up a rift (I suspect stronger or even prescription lenses could be found online with sufficient digging though).
Aside from those issues, it's pretty dang cool. The demo sitting at a desk was pretty neat; aside from the head tracking losing my position due to sitting about 4 feet closer than I'm supposed to (it recommends 5 feet), it managed very well to keep up the VR experience.
Elite Dangerous was a bit more interesting. Being able to fly past an asteroid, craning your neck back to watch it pass overhead is really cool. Unfortunately, due to aforementioned vision issues, using glasses was a bit annoying, while not using them left everything too blurry to legally fly a spaceship in empty space, let alone a dogfight. There was some framerate choppiness, though I hadn't turned down the settings, so that wasn't much different from normal.
Then there's the people demos. There's a whole bunch of these sort of tech demos, some with CG people and some with actual laser-scanned recreations of people. These are super-cool. I had heard a lot about these, and how they apparently invoked a sense of 'invading someone else's personal space' and can wholly confirm that. The head tracking combined with the very good 3D very much gives you a sense of 'being there' and makes it feel much more real than you would think it would.