Pretty cool concept. Rolls are very reasonably priced. Agree with other reviewers, regarding subway layout, but it works well. I can't remember a sushi place that has build your own roll. You can also get a sushi burrito, bowl, etc.
For what this place is going for, I think it is very good. It's not gourmet sushi and that's not what you should expect. If you want better than average sushi, want it quick and want a fun, unique restaurant, then you shouldn't be disappointed. I will be back!