I went there about a month ago with a reservation. After we arrived at the restaurant, we were repeatedly turned down by customers without reservations, so I think reservations are a must.
We ordered the omakase (a special order for three) and everything was very tasty, and we enjoyed our meal as we were introduced to how to eat it and what was in season. It took a little time for the first dish to arrive, which was understandable since the restaurant seemed to be very busy. However, after the first item came, they came one after another, so maybe they were preparing the food. It was not so much of a bother as long as we talked.
I would like to go again.