The food here is great but don't believe that they open at 11:00. The sign may say it's open and they'll let you in to sit at the table, but if you get there when the doors open what you'll see is an empty buffet with half a dozen people yelling at each other while they try to fill it by 11:30.
Seriously, if it's really not open until 11:30, please don't open the doors until then... (perhaps you should charge half price for the people who come between 11:00 and 11:30? They only get half a buffet!)