My Advice
Do not go on orange... i repeat...do not go on orange...it made me feel like death was near.. and I am rollercoaster and ride fanatic...
Roller coasters and spinning things are 2 very different things that our body responds to with different processes in different ways. You just can't compare them. The body doesn't have a single way of reacting to "thrill rides." it has ways of reacting to individual situations.
I love roller coasters -- the loopier and faster and higher, the better. But old original Mission:Space, and even the "teacups" in MK for that matter, make my stomach very uneasy, make me feel dizzy for up to 2 hours later, and make me think seriously about decorating the floor and ruining my shoes ... and yours if you're too close.
My inner ears are apparently very wimpy. Roller coasters don't have the intense and sustained spinning necessary to make my inner ears cry and scream for mommy.
My father-in-law is the opposite. He refused to ride Splash Mountain because it was too high of a drop. And after riding Goofy's Barnstormer with my then-5 year old, my FIL looked like he was going to lose his lunch, and he needed to sit for a few minutes. But he was absolutely untouched by the old original M:S. He even made fun of how green I looked. He refused to believe me that we were spinning in a centrifuge. I asked how he thought the g-forces were produced, and he said there were no increased g-forces, that it was all done by video special effects and the power of suggestion. He is blissfully clueless.
So M:S does not affect everyone the same. I'm glad I rode it before the changes, because I'm sure if I had the choice I would have avoided orange, but I wanted to ride it so much I took the chance, and I'm glad I did. I just rode the green version with my 6 year old a few days ago. It was enjoyable, but the old original (orange) was much more of an "experience."
It's not only unfair, it's incorrect to tell people that they MUST avoid the orange version because they WILL feel a certain way. We don't all experience things the same way. If that were the case, I'd be picketing outside the Teacups and Dumbo.