Sushi is one of our mainstay foods especially when we travel and are eating late at night. And Mushashi really caters to the late night crowd. If you can sit at the bar, ask for Roberto. We've watched him evolve into a really great sushi chef, and we really like the interaction we have here. Be sure to inquire as to the "belly" fish on hand - it's the best sushi.
Happy hour starts at 11:00 pm till 4:00 am - and they have a special menu for the occasion, meaning that two can eat very well for $30.00 or less.
Never eaten at the Tappan bar, so can't comment on that side of the house.