My first question is probably the most obvious one: How much does it weigh? I'll never understand the obsession these companies have with putting all of the hardware on your head. Would it really be that bad to run a wire from your belt up the back of your shirt? Or hell go wireless, I doubt attenuation would be an issue at that range so EHF should give an adequate throughput without the need for too much error correction.
I love the idea of augmented reality though. As fugly as it is, I want one.
I have the same problem with augmented reality as I do with touch screens - the user-input system is difficult to perfect and despite things seeming intuitive, everyone's intuition works differently. I would only use AR in conjunction with a traditional keyboard, mouse, and monitor.
In terms of playing video games though, a controller is just fine. Just please, for the love of god, don't add any sort of motion gestures as a required game mechanic.