We are sailing on the Jewel of the Seas this November, and I have learned they have a sushi place as one of the up charge restaurants.  I believe it is called Izumi.  My wife and I happen to be fairly obsessed with sushi and we eat good sushi as often as possible.  I was curious if anyone here has tried this restaurant or it's equivalent on a sister ship?  If so please describe your experience if you will.  


How does the up charge work?  Is it a la carte?  If it is a simple flat fee I fear we may put. RCCL out of business lol!  Did they have a good variety/quality?  What else haven't I thought to ask?


thanks :)