I'd love to hear if this is back open too.
We took my son when we was eight. He was never interested in a character breakfast at Disney, but this was right up his alley.
Last October (my son is 14 now) when we were at the park and walked past, he asked if we could go, and we got last minute tickets and really enjoyed it. So we've actually gone twice now. We didn't get pool side seating, though, this second time, and my son would like to go again March 2011 and wants me to sign up as early as I can, figuring our chances to get pool side seating are better with early sign up.
Personally, I think of this as being overpriced for what it is, a buffet with good but not great food and a half hour talk by an Orca trainer or two with one of the Orcas in a close by small pool doing a few things. If you are a personality who just can't get enough of Shamu / Orcas, though, why not? It's a very pleasant / enjoyable experience. I'm a sucker for my son's enthusiam and am planning to go again in March if this is open.