I rode it in September. I followed the instructions exactly - head back, eyes open and look forward. I didn't have any trouble, but then I'm ok with spinning rides. The only discomfort I had was afterwards my face hurt from the pressure of the g-forces... but that went away about 20 minutes later - kinda like sinus pressure but from the outside
I've had people tell me that if spinning rides bother you because of the visuals, then if you follow the instructions re: Mission Space, you'll be ok. If spinning rides bother you because of the actual spinning, then don't do it.