It's not the best sushi on the planet, but it's certainly not the worst either.
Not by far.
Downtown, there are only a handful of decent places and I suppose Fune is one of them.
But the real reason anyone goes is that the sushi bar is surrounded by a river, and you get served on a series of wooden boats chained together and floating on the river.
And THAT is some coolness right there. Best for a family or if you have kids or people who have never tried sushi cause "raw fish is gross" with you.
The service is pretty decent too.