Now this is not the best buffet in Vegas, however, I believe that it is the best VALUE in town. We mostly only go on Sundays for Brunch but the normal buffet runs around $10 for breakfast and lunch, $15-25 for dinner (depending on if it's a specialty night) and brunch runs $15.99 on Sundays. These prices are for if you have a players card and if you don't it's easy to get one, plus I recommend getting one anyways, because every month they will send you free $ to use at any of their eateries or buy 1 get 1 free buffets on top of the already great prices.
Now for brunch you also get unlimited champagne and/or mimosas for that $15.99 price. They also have all the breakfast items with an egg/omelete station, meat carving station with all the meats, international stations, a mongolian bbq station where you can get custom bowls made (also you can just get plates of shortribs cooked up for you - yum!), the salad bar and a fun dessert section (you can get mock coldstone ice cream).
The line will get long so I recommend coming at noon or before :)