Since my dining companion only likes maki rolls and cooked stuff (and I'm paying her tab), we chose the lunch. All in all, it is pretty good. Everything was fresh. There were many maki rolls, nigiri sushi, salads with sashimi, seaweed salad, tempura, rib-lets, udon...etc, etc. Oh, and there is a whole length of dessert buffet I did not even touch cuz I was saving every cubic inch of stomach space for seafood. The sashimi salad and seafood soup were my favorites.
To a seasoned seafood lover such as myself: nothing was too exciting but everything was good. Yes, the sushi buffet I had at Sumo in LA was way better, and the various tiny authentic sushi bars offered me more exotic choices. but hey, I'm here in Vegas and this is a good giant buffet.
One tip: if you don't like sashimi or nigiri and consider multi-ingrediented maki rolls your favorite sushi; save yourself about $10 pp and go for the lunch buffet.