I think when reviewing restaurants like this you need to keep things in perspective. This is an all-you-can-eat Sushi restaurant. So it should be compared to similar restaurants. Obviously, if you want outstanding sushi and service there are other places for that.
That being said, I enjoyed this place. Comparing it to Kanda, this place had a better selection of Sushi and fresher Sashimi. The mackerel sashimi was great and I've never seen it on the menu at all-you-can-eat places. Also their regular sushi menu has salmon roe sushi which is amazing. I don't think the Friday/Saturday special menu is quite worth it. There are some clever sushi rolls on there but nothing will amaze you. You can get the same ingredients in different rolls.
In all of these restaurants the service is sometimes lacking. I think it's understandable considering the type of service required. The night I was there they appeared to be understaffed. I had to wait a few times to get someones attention to order or to pay at the end. Starting around 6:30pm, there was a line beginning at the door. I'm not sure if they overbooked their reservations or this was due to being understaffed. I definitely felt bad for people waiting for us to leave while I waiting almost 30 minutes to pay. Although I didn't mind because I wasn't in a rush and I'm a lot happier they didn't try to kick us out (like some other places).
Definitely worth the money. I would recommend booking reservations for an early dinner (6:00pm) or prepare to wait at the door.