When we visited, the Halloween Ghost Galaxy overlay for Space Mountain was in place, and it was excellent. Essentially, there is a space ghost (not the one from the old Saturday morning cartoons) who chases you throughout the course of the ride. It is a very cool effect. My whole family loved Ghost Galaxy and we rode it several times. I also loved the way the onride music ebbed and flowed with the track layout, and how it swelled whenever the ghost appeared. Many people say the Disneyland version of Space Mountain is better than the Florida version, but both versions are a whole lot of fun, and are different enough that they can mutually coexist. If I was forced to pick one or the other I guess I would give a slight nod to Disneyland's version, but my wife says the opposite. Either way, Space Mountain continues to be a fun and invigorating coaster.