I made a reservation for a Saturday one week in advance with no problems. We came about 10 minutes before our reservation and were seated within 2 minutes. The servers were always around to clear the table or grab napkins for us.
The food selection looks great on paper but there were a lot of items that weren't available to try like the truffle carbonara udon. Without those special items, Kaka is pretty much the same as any other AYCE sushi place. Definitely worth a try if you are curious but won't be back again for the price point or until every item advertised is available.