I went to Kotobuki for the first time on Friday, and let me say that it was phenomenal for the value, and very good overall.
We got a couple of rolls- I think Yellowtail and Spicy Tuna- along with some nigiri and sashimi- toro, tuna, salmon, yellowtail, flounder, and lobster. The rolls were good. I like to usually get one or two. I guess my only complaint is that there weren't many "fancy rolls" that combined different fishes. But when you pay less than $3 a roll, you can't really complain about that.
As for the nigiri and sashimi, that was phenomenal. Everything was really fresh. The yellowtail was so buttery, as was the toro. The salmon was also excellent. The lobster was ok, so I probably won't get that again.
We ate lots of sushi, each had some sake, got a bowl of rice and some miso soup. This was all $40, plus a tip. What a deal.
Another small complaint- the place was crowded on a Friday night at 8 pm- some people even had to wait. I know word is travelling about Kotobuki and 8 pm Friday is a crowded time, so maybe going on a weeknight would be better.