I've tried the Vibe and the Microsoft Hololens. The Vibe feels like a minor improvement over Jaron Lainer's original unit from the 1980s, which I tried back then. It's still too big and heavy. The update rate and position tracking are at last acceptable. It's going to be popular with the FPS gamer crowd, but beyond that, it doesn't seem worth the trouble.

The Hololens packs an incredible amount of hardware into a small package. That's a very good piece of mechanical and electrical engineering. While it can't really "draw dark", it does a decent job of trying, displaying against a filtered background of the real world. It's also cordless, which the VR guys really should have had by now. Its display field of view is too small; it can't maintain the illusion of markers on the world. A wider field of view and it will be useful.