Well it's primarily for immersion after all.
But you two ruined my excitement as a gamer. My excitement for the technology is still there though.
and yes, probably very useful for SP or Coop. Thinking about ArmA2. Would be so cool.
But quite frankly if it came down to it I woud choose enjoyment over KDR, and if the Omni would turn out to make me enjoy all FPS more, then I'd use it in MP too - that is if I ever have the funds to not feel bad about buying this.
Also it doesn't rely on the rift, they just use it because it's apparently their favourite and they're in a partnership. You can use other VR goggles.
I don't find enjoyment fighting the UI and input systems, that's just me though.
If something is unresponsive and imprecise... I tend to get very mad.
This is competitive gaming though.
Single/coop would be fine though, as i am not competing with actual people.