Very authentic Japanese noodle house; note that most of the customers when I've been there have been Japanese natives.
It gets crowded, and the service can sometimes melt down a bit (don't sit at the counter in back, they'll forget you).
But on a cold, rainy day slurping noodles and soup there is definitely something worth driving for.
They have good - to superior sushi as well, and a typical Japanese roadhouse full menu (katsu, tempura, teryaki).
Pros: Truly superior udon and soba