Well, I've ridden the original at Disneyland Resort Anaheim, so I'll tell you about that:
Basically, the ride is a simulator. An absolutley fantastic one at that. You enter a room that is initially quite dark, so you can't see much, and board a seat within 2 sets of 3 rows. These are held from above, so you feat dangle. These rows and chairs then move upwards and forwards so that you all have a view of a huge, curved screen. It is not 390, but is large and circular, and is basically ment to compliment your natural vision when you see things. The film then starts, and basically the huge screen makes it so you feel like you are sweeping and soaring through various idyllic American scenic locations, supposedly in a handglider. It realy does feel like you are gently floating by lakes and mountains and such, you can feel like you are gonig slower and faster, and with each scene wind and cold temperatures and such accompany. And at the finale it takes you sweeping into Disneyland, with fireworks, and tinkerbell floating past :D.
Wow, gives me goose-bumps thinking about it... and makes me so nostalgic of my holidays to Disneyland. Absolutley amazing ride. Really is, especially for a foreigner, it just sums up the great holiday destination you are at beautifully. A must ride!