I just got my DK2 to work and so far it hasn't been a fun experience. I can get the rift to work and track left right up down as its supposed to (though I have to rotate my display to get it to work right which is pretty frustrating as extending my displays causes the monitor to be flipped).
However, the positional tracking isn't working right. The camera refuses to be detected. The drivers for the Runtime Config installed, but during the install I got an "install failed" message. My computer says the drivers are working perfectly for the camera.