I'm dying to try this place, just based on this review:
http://sfweekly.com/Issues/2006-07-19/dining/eat.html
For very high quality sushi in SF that won't break the bank, I like Sanraku in the Four Seasons on Nob Hill (stay away from Sanraku in the Metreon :barf)
For reasonably priced but still quite solid sushi, I like Miyabi on Church and Zaoh on Mission.
For really really cheap but mediocre...er, don't ask :blush
Anyway, it depends on your definiton of "great". Some people swear by Blowfish but I can't stand the clientele. Enh. Everyone's got a favorite. Eat at lots of 'em and pick the one you like best
Also, yelp.com is a great reference.