I mentioned this to John Carmack over twitter once. He ignored me, I was an early dk2 owner and was close to having panic attacks in the beggining. I later learned that it had partially triggered PTSD in me (it came from another cause entirely, a traumatic event in my past) and it took me months to get over it.
This is all entirely down to personal subjective experience, but it was strange to see back then how I couldn't get any attention on the issue. I've met a few people who have had strong negative reactions of anxiety and dread after experiencing VR.
