I live in LA but visit LV often since it's not that far of a drive ... every time I come, Sushi Mon and Rosemary's are the 2 places I ALWAYS have to dine at.
I am a sushi fanatic and this is the best sushi buffet ever! Everything is made fresh to order and they have a wide variety of rolls. The best thing is that you can do half orders so you can try everything!! I really don't get how they make money?! haha They even have a punch card and after 12 meals you get a free one! They aren't skimpy on their fish and they don't over power the rolls with excessive rice.
The only bad thing I have to say, is that sometimes the sushi orders aren't cut the best and it has the little silver fiber thingies which doesn't make for easy eating. But the rolls are so yummy. They had a new roll "mesquite" which was reaaaaly good - spicy tuna roll topped with mango, salmon and a yummy mango sauce. The mahi roll is good - it has mahi mahi, asparagus and shizo leaves. The chubby roll, hawaiian, spider and orion are all great too! They have poke and seaweed salad too!
If you go with people that aren't huge sushi eaters - they can either order off their menu or do the all you can eat which also includes tempura, gyoza, teriyaki, miso and more. Plus ice cream!! Red bean, green tea or plum wine. So worth the money! And they are open til 2 AM so perfect after those late night gambling runs!!