We tried the Brazilian Buffet in April, used a BOGO coupon. It was OK, nothing memorable but certainly better than the last time I tried the buffet at the Mirage. Comes with a Brazilian cocktail which was different, very sweet. Had to ask for the cocktail, weren't being handed out freely.
Don't think it was worth full price, few buffets these days are, but if you have a coupon and are in the area it is a reasonable deal. Good VP schedules in the casino and drinks came pretty regularly.