Just got DK2:
I tried a million demos on DK1 and never felt that motion sick feeling even on rollercoasters and such but holy God did CyberSpaceDK2 make me want to puke almost immediately. In a good way. DK1 was incapable of doing that for me but it seems like DK2 is capable of far more immersion.
I thought the black borders on the sides would bug me, and I was right, but I think it's something I'll get used to. That isn't to say that I don't want to see that problem eliminated for CV1, but it could be worse. The resolution is also obviously still lacking, but there's not much that can be done about that right now. The camera needs to be farther away than I think most people have their monitors (I have it at like 4 feet and that's lacking) which could be improved as well, I'd hope.
I'm still getting it setup and I'm running into a little weirdness. I thought I was getting screen tearing, but I don't think that's the case. If I close my right eye, the left view is perfectly fine, but if I close my left eye, the right eye has some sort of artifact that looks somewhat like screen tearing crossed with blurriness whenever I move my head. I made sure I was keeping 75hz in the demo, so I don't think that was the issue. I'll look into it more after I get the IPD properly measured and setup.
If any enthusiasts are on the fence I would tell you to not buy it. It's close enough to being there that the ways it's not yet stick out like a sore thumb. If you can wait, I would definitely do it, although I think I'll get my monies worth out of it personally.