Pretty decent to get your AYCE sushi fix. My fiance and I ate by the sushi bar and based off the random rolls and nigiri pieces we picked out, I thought this place was "ok" as I judge my sushi by quality over quantity. (Though, I will say, it is expected that quality does go slightly down in an AYCE sushi place compared on one that isn't AYCE so my opinion might not be too fair.)
Finishing off my meal with the 808 dessert was quite a treat. The service didn't stand out to me and the inside of the restaurant doesn't appear to be anything special either.
On one last note, I do order breakfast with Island Sushi more frequently than I do sushi and love their menu. I usually order a two egg plate and malasadas. Their malasadas are made to order. I thought their malasadas are "ok" as well; it tastes too dense for me and the custard filled one kinda tastes like instant jello pudding mix.