[petercooper]

You cannot play first person games. As cool as they are for the first minute, beyond that motion sickness kicks in.

It's only one data point but I've not had any nausea with extensive playing of Minecraft and HL2. Indeed, the biggest problems by far are the lenses steaming up and the gigantic pixels/low resolution (I'm not even sure 1080 would improve this significantly since it's already 720, isn't it? It feels like it needs a doubling, at a minimum.) However, every other (adult) person I've tried it on has indeed felt quite nauseous very quickly.

Like others though, I think the big initial wins won't be in FPS games since they also encourage you to run around and interact with an environment that doesn't exist. Flight sims, space sims, underwater sims, racing sims.. this could be a huge deal.

[ravingraven]

It 100% will be a huge deal with flight sims. The Rift is ideal for that. In a few years, playing a sim without some kind of high immersion device like the Rift will be like playing a flight sim without a joystick today.