The headphones are pretty bad -- and not isolated. So part of my brain is hearing "living room" while the rest is hearing "wide open space." I posit this contributes to the problem. Also two imperfect immersive sources (video + audio) that each lag is far worse than one.

I was glad to see Oculus was tackling the problem... then I got a look at what they were actually doing. Can't say more other than to point out there's a lot more work to be done.