We are regular visitors to SW, and DD and I reallly enjoy Odyssea. We make sure when we have guests that we fit it in, and most have enjoyed it as well. We have caught Fusion only once, but I thought it was a really FUN show!
We have guests in town and are visiting SW this week (with the buy one day get 6 more consecutive day tickets for them!) and I plan on catching both of the shows. We were there yesterday, but made a short day of it - kids did the new Shamu coaster, Wild Artic, and we wandered through Shark Encounter and had lunch at the Shark restaurant!