I have been using an Oculus Rift for a few weeks and the experience is breathtaking. For example, there is an Apollo 11 educational game where you get to experience the mission from the point of view of Neil Armstrong or Michael Collins. I think it is hard to argue that "experiencing" history isn't far superior than reading about it. And the pure games like EVE Valkrie give you a cold sweat they are so immersive. Just my The cost right now are high, but no more than an iPhone. I think mainstream isn't too far away. My $0.02 at least.