I know it's OLD, but I still like it. Even that other Project is exactly the same, but smaller.
Yet that Omni is actually the same as the video I placed, yet it's combined with the Oculus Rift.
Where are the machines that are shooting you in Omni? I don't see them, thus you aren't immersed in the game even with the Oculus Rift, as you don't feel the bullets. That's the main difference.
Why not Oculus Rift + Omni + those weapons in that Battlefield 3 Simulator? Than you are in the game and if they shoot you, you also feel it. Now in that Omni video, the guy gets killed and he doesn't feel it.