I've never sat down to eat here, just ordered take away. My only gripe with kawa sushi is that sometimes I'll be out running errands and need to order here so that I can finish, then pick up. More than once they haven't been open until 11:30-11:45. I know it's a trivial thing to pick at but it's kind of annoying.
Having said that, the quality, for what you pay, is excellent. I love ordering a bunch of rolls (rock n roll is my favourite) and watch kung fu movies at my friends place while grazing.
I've never had to wait longer than 10 minutes for my order which I think is pretty good. Service is nonchalant but not impolite. which i actually kind of enjoy!
Don't go in expecting MIND-BLOWING HOLY CRAP delicious rolls. It's very tasty with a price-point to match. That's why it's a good spot to eat.