I typically eat sushi weekly, and fortunately for me, was made aware of Ninja this past month. I think I have been there nearly 10 times this past month or two alone.
Ninja offers great food at an unbeatable price. The Boston roll is my favorite roll that I have had anywhere--only $4 on happy hour too! The Spicy Tuna is better than at Kona or Ra, too, and for a lower price ($3 happy hour, for instance). $20 all you can eat with great selection--try the Albcarore.
Asahi bombers for $5-$6--they also have delicious plum sake. I wish I had known about Ninja a few months ago to celebrate my birthday rather than Ra. Ninja would have saved my group $100-$200 and offer a better overall experience, namely in quality of food.