Reviving an old thread here...
I've done this three times now (twice on our last trip) and can highly recommend it. The food is great and you get really close to the whales. They normally used Tilica, an adult male 22' long and 12,000lbs. Booking in advance is a good idea although we once managed to get a last minute place on the day.
Other threads ask about the Kraken and the Manta coasters. I have ridden both. The Kraken is a typical inverted coaster and an easy ride if you enjoy Disney's coasters. The Manta has theming that's almost up to Disney standards in the queueing area, passing through tanks full of ray's. The ride itself is unique in Orlando with it's 'flying' riding position which feels quite natural once things get going and after the first really tight loop is pretty gentle.
I can only please one person per day. Today isn't your day... tomorrow doesn't look good either.