I've went there because it was closest to the Central Library. I regret not walking further to have my lunch at ebi-ten instead.
I ordered a combo of $5.99 with udon and sushi. The udon's bowl is large, but the udon & the food is less than half of the bowl. The food is extremely salty, so I was lucky to have bought a water bottle that day. The udon is less than half the package you get from superstore, and its about $0.49/one package.
As for the california rolls, it looks like a big roll from the top, but if you turn it around, the bottom looks like a direct opposite. From the bottom, you can hardly see any fillings than when you look at it from the top. There are not a lot of avocado, but there are traces of it.
I am not sure if this location provides authentic japanese food since most employees speaks korean....
Sushi originates from Japan, so its to you to decide.
Its definitely not expensive, but the food is absolutely less that what you would see from the picture posted outside the restaurant. As for the quality, there are large rooms for improvement, at least portion-wise.