Well right now it's being completely gutted and rebuilt, so who knows what the new incarnation will be like. But previously it was pretty different. There is only one track, not two like at WDW. Riders sit side by side (picture a rocket with the seating arrangement of WDW Splash Mountain). And my favorite difference, the soundtrack. There was this "space music" that played, and IMO it totally made the ride. It was/is very different, and even though I am a WDW girl at heart, I did think the DL version of Space Mountain was better.