While the food shines at this sushi spot, the problem with Okane is the service. The waiters attempt to be professional but fall short on many levels. If you want to have a pleasant experience, I suggest you go in with low expectations about the service and with a little bit of time on your hands (conversely, if you go in late, you can expect to be rushed out the door).
Service aside, their rolls are consistently good and tasty. I've been eating here for a few years now (on and off) and it looks like the sizes of the rolls have beefed up since the opening of the all-you-can-eat Kanda restaurant that opened up further down the road. This is probably a good thing for most people, but I prefer having dainty makis with one slice of avocado opposed to three. Either way, I probably shouldn't complain because you'll end up getting more yummy for your money!