We went to the buffet last month and if I remember correctly it was $50+ per adult, which did not include the tip. I can't remember the child's cost as our DD is older so is charged as an adult.
There was plenty of choice on the buffet, the quality of the food we tried was great, the entertainment was good and the kids all seemed to be having a great time with "Aunty". Service was good and our server actually offered us drinks to go, too.