We too have done it twice and love it!!!! I would definately recommend it. In fact, we are going to do it for a 3rd time in April for DS 5th bday.
Captain Hook summed it up beautifully. The first time we went they did actually do a few big tricks. It was a much better interaction experience than the second one where it seemed more of just a few little tricks and a lot of talking by the trainers.