We tried Zento after a movie at the Bourse, and this was our first impression:
Pleasant, simple space, with nice wooden chopsticks instead of the disposable kind you usually encounter. We only tried the sushi, and therefore this is far from a complete review. The fish was too cold, detracting from its flavor. Otherwise the quality was good. The portions are small for the price they charge, but not unreasonable. I would not go back because the fish was too cold; that counts as a major drawback for me. (I've noticed that some sushi chefs place the fish on warm-ish sushi rice, and I always thought this was because the rice was prepared too recently, but now I wonder if it's an intentional way to take the chill off the fish?) Also, if you're sensitive to escolar, be aware that they include it in the chirashi and on the menu as "white tuna."