Depends on how afraid of heights you are. Its really smooth and a great experience but if you're seriously afraid of heights you might want to sit it out. My father-in-law is deathly afraid of heights but gave it a shot and was dizzy for about fifteen minutes afterwards. Looking back it was kinda funny but he definitely effected.
as someone who is afraid of heights, when i felt me going up i definately closed my eyes and then to open them to seeing nothing but clouds...well let's say my death grip i wouldn't have fallen anywhere!
My wife and I rode this and we both absolutly positivly loved it. I was a little surprised at how high you actually rise off the floor. And it really felt like you were...well... soarin' over very scenic areas. Amazing! This is a definite must do!!
Nothing like star tours or body wars, trust us. My Dad gets sick on anything with a big screen and moving seats but this we went on twice and no green. Its really hard to explain because it is nothing that you would expect.