Here is the Sushi Roku website with menu:
http://www.sushiroku.com/sushiroku/index.htm
They have more than sushi. We went for lunch in 2008 with reservations but we were, for most of an hour, the only patrons dining.
The sushi is decent and the hot items were hit and miss. Being from Vancouver (and being taken to many top sushi restaurants in Tokyo by my relatives) my standards for sushi are high. I still feel that Shibuya at MGM Grand is a better option.
Reservations at Shibuya are a must. Perhaps so for dinner at Sushi Roku.