For quick, cheap sushi, you've found your place! I picked up a classic bento box from Big Sushi the other week, and after calling in, they said it would be ready in ten minutes. Crazy!
The bento box was enormous. Could be for one extremely hungry person, or two peckish people. Came with a full California Roll, vegetable and shrimp tempura, a green salad, miso soup and chicken teriyaki and the final price was under $15. Sometimes I forget how cheap things can be when you don't order in...
While, it's not competing to be the best sushi joint in the city, Big Sushi definitely delivers great value and is decently fresh for what it is. Enjoy.