So, I went to this conveyor sushi restaurant in Shibuya, Tokyo on Saturday night - Sushi Daidokoya . It was right underneath the apartment where we were staying so it had the benefit of convenience.
It had outstanding selection, fresh fish, amazing prices, and welcoming environment. For reference, the yen and Canadian dollar are close to par, so ¥100 is very close to $1.00 CAD. I had eaten dinner earlier, so I limited myself to just 10 plates:)
The English menu had about 60 items of nigiri and rolls. Despite being a conveyor belt sushi restaurant, the chefs made everything to order in about 30 seconds. Just yell out your order. The belt was just used to promote specials and other things that are off-menu.
The food was really good, though the rice didn't have much seasoning. I'm not going to claim it could compare with the $400/person top sushi restaurants in Tokyo (like Jiro), but it was a great way to try new things, it was a great experience and outstanding value.