Good
I suffer from motion sickness in first person shooters - the cockpit frame in a simulator allows me to focus on that and not get sick - I was worried about the occulus rift.
My experience (I also discuss some technical issues with the developers)
a) it was on canyon network

no mechs to shoot at - just movement
c) the system was set to standard vision
1) no motion sickness
2) clear and clean
3) was running at >40fps
4) it was not a low end system - the specs on OR are just high no matter what
5) could look to left while jumping and moving arms right (full up/down/left/right)
Issues discussed with developers
1) on the test rig they were sending the signal at 1080 but the OR was displaying it at 720 (but it was still clear)
2) HUD - while i did not notice it in testing the developers said they had an issue with the HUD (partial redesign - internal - might be needed) - when I went back I could see what they ment - not possible to explain in text
3) I personally think they need to have certain data on the HUD rather than on the screens
4) The OR is not yet out so no time frames
5) discussion about - just how many people were really going to be using OR (none of us knew)