For all you can eat, you might imagine poor/low quality, but not at Mr Tokyo! My expectations were very much exceeded during my first experience and each time I've gone since. I got about once every other month and it's always great quality and stellar service for a decent price.
If you're not into sushi or would like to try it for the first time, I would also suggest going to Mr Tokyo since their "all you can eat" menu includes more than just sushi. It's a great way to experiment and fun for all ages (even includes chicken nuggets)!
They recently changed up some of the sushi rolls on the "all you can eat" menu which made tonight's visit more fun. I've learned a lot about what I like and dislike in my sushi rolls from Mr Tokyo. But be aware that you need to eat what you order or you'll have to pay for leftover food.