I just ate at the 6-7 for the first time this weekend. I certainly wouldn't call it a Japanese restaurant... I don't think they would call themselves a Japanese restaurant either..? It's more of an upscale seafood place.
The food was pretty good, but I don't think it was worth the $$$. Luckily the friend I went with was on an expense account, so it didn't hurt my wallet!
Pros: great deck & view, location
Cons: expensive, hokey, hip decor