Note: there may be SPOILERS here for those who want to be thoroughly surprised so....
(spoiler space)
It's a terrific ride. Beautiful scenery, nice and smooth and yet quite exciting for what I'd consider a non-"thrill" ride-- it feels like you're really "soaring" over the CA landscape. I didn't experience motion sickness, and I am prone to it (can't do Star Tours, Body Wars without feeling ill). Soarin' might not be for those who are afraid of heights though, as the design of the ride vehicle (the "hang glider") is in 3 rows, starting horizontally for seating and then they swing up and stack vertically for the ride portion. Those in the top row are pretty high off the ground. Also, the film itself gives the illusion of great heights. Only thing I wasn't crazy about were the jump cuts in the footage. It can kinda take you out of it for a split second. Otherwise, it's fantastic.