Can't comment on the sushi there but I remember going to Japan as a child and there was a similar thing, sushi on a conveyor belt! Always wondered if it was the same chain in the UK or a rip off of the idea. I'm allergic to shellfish so I'm really nervous to eat there, although the big chains are usually pretty good for taking it seriously I guess.
There's no Yo Sushi in Japan

. But there are a LOT of conveyor-belt sushi places. That idea did originate in Japan. The difference is that in Japanese places you've got the sushi chefs in the back making everything fresh and nothing's covered in plastic. They make the sushi, pop it on a plate, send it out, and you just grab what you like. People used to talk about how many plates they could eat. I know some Japanese people who have spent hours there just eating sushi, resting until they're hungry again, and eating more.
For the record, the most I managed was 15 plates, and I thought I was going to explode. I think my husband got to 19. The most I ever heard of was 25. They also send out jello/pudding for dessert, so you get the whole meal. I miss that place so much.