We did this tour in October and loved it. Our guide was very informative. You get reserved sitting at a number of shows. A few rides are front of the line, no wait. You break for lunch. You get some behind the scene looks, too. There were a few, great photo opportunities like holding a penguin. You get a little remembrance of the tour at the end. You go at a pretty good pace but you accomplish alot for the time you're on the tour.
I've been on alot of these tours including those offered at Universal and Disney. The Sea World tour is quite good and pretty reasonable considering what the other parks charge for their tours. Go for it.