Oh, forgot to answer the second part of your question, "is it good?"
Personally, I found the sushi to be not as good as what I get at home at my favorite sushi restaurant. They usually only have a couple of kinds, and none of it seemed to be true sashimi, but was mostly vegetarian or made with cooked fish. Definitely give it a try yourself, though, and see what you think! I'd love to hear your opinion of it when you get back.
If you are a sake fan remember that it falls into the wine category and is permissable to bring onboard. I just went to buy some for our Alaskan Cruise-good thing I did, I found out our favorite brand is ceasing production. Needless to say I purchased 2 cases.
It wasn't the best sushi I've had, but not the worst either. My son loved it, however and he's a pretty big sushi fan.
Carnival Elation March 11
Carnival Imagination Sept 07
Carniival Sensation Dec 06
RCI Sovereign of the Seas Sept 06
Carnival Miracle Sept 05
Carnival Glory Sept 04
Carnival Fantasy Jan 04
"Is the sushi a "specialty" item that you have to pay extra for? "
I hope not! we're going to be on conquest next August (2005) for our 20th ann. and definitely looking forward to a nice sushi app. every night before dinner too!