I've only been for lunch for the all you can eat.
The service is very slow, BUT that is because all the sushi is fixed to order. Nothing sits out with people grabbing or setting tongs on top of the food after handling them. Not all rolls are available on the all you can eat menu, but I'm not complaining, the food that is on the menu is great! They even have inari, whish is difficult to find sometimes. I recommend you try one.
For all you can eat lunch, you get to pick up to 10 items at a time per person. once you get you items, don't hesitate to order more as long as you know you will be able to eat the majority of it without being wasteful.