My sister and I received a couple of "buy one, get one free" tickets for the Luxor Pharaoh's Pheast Buffet when we participated in the free screening at CBS Studios--so we ate dinner at Luxor on two nights and breakfast one morning.
The Pharoah's Pheast has everything you could ask for in a buffet: fried chicken, tacos, Italian, etc., and that's just dinner. Breakfast had eggs, sausage, cereals, toast, bagels, and more. The food was hot and tasty, and filled us up enough to enjoy our day of gambling and shopping on the Strip.
The waitstaff at Luxor was always there if you needed a soda or coffee or tea, and they refilled glasses every 5 to 10 minutes. They were courteous and professional, and worked fast among the crowds.
Be sure to get to Luxor early in order to get a good seat and to avoid waiting in line for a table. Reservations are accepted for large groups. Luxor is open 24 hours a day for all three meals.