Has only been open once in our 5 trips. But we really enjoyed the change of pace. They let us exchange the dessert option (for the DP) for 2 egg rolls that were quite tasty.
Every trip we go see if it's open and are always sadly disappointed. They really should make it a permanent fixture. It was fresh and tasty. Maybe not the best sushi, but it was a great change from the burgers and fries.