I work nearby and eat lunch here on a semi-weekly basis. For the price the sushi is quite good. They have a "happy hour" menu for lunch with great prices on good rolls. Their specialty rolls are excellent and have some interesting combinations.
The building Mr. Sushi is in screams "hole in the wall" but don't be put off by it.
Service speed can be a bit spotty when it is busy but the wait is worth it in my opinion.