DO NOT GO HERE. The customer service is awful. The waitstaff rushes you out the door within minutes of you paying. In no way is the food worth the terrible experience. There are far better restaurants in Pittsburgh, which don't take reservations, that don't tell you to leave as soon as you pay (e.g., Point Brugge).
If you want good sushi, go down to Kiku in Station Square. Don't waste your time and money at Chaya.