Certainly can't hurt, especially if you want to sit in a specific area. Upstairs is nicer. But, most nights, there's enough seating even without reservations.
The bar area has limites seating and a walk in area. Im sure a reservation is a good idea, however I have shown up and waited 5mins in the bar area to be seated.
They are very busy on friday and saturday nights. I would definitely make a reservation.
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