I may have to post a clip of some of bob's work on Tuesday if I don't have the release ready by then. It really is that impressive. For me, it's less that it looks awesome (which it does) but just how much it changes the feel of things.
Luke has to defeat the Emperor now, or he would be able to flee and fight another day. Now, because Luke is successful in his goals, the galaxy is free of the Sith. It just adds so much more to the story. Very, very exciting stuff.