Pretty good for Japanese food in Switzerland
The idea is good in Yoko, having the conveyor belt of dishes. The quality of food is pretty good, however each dish contains soo very little, you'd have to spend a fortune to ever get full! We often go just for a taster and not as a meal.
The best (affordable) Japanese food in Basel comes from Wasabi, a take-out behind the SBB that serves three set menus between 11 am and around 1:30pm week days. Sushi day is Friday, though I think their best dishes are served Monday-Thursday.