I have eaten there for breakfast and enjoyed it! It's a really nice buffet.
They don't take reservations for breakfast...It's walk up only 6:30a-11:30am daily
Are you going during the week or on the weekend?
The weekend is a character breakfast with 2 characters.
The Characters don't start until 8am.
When I went it was Pluto and Goofy, but I think the characters change.
They give 3 discounts Disney Vacation Club 20%, Tables in Wonderland 20%,
AAA members 10% (must have your card)
The weekend Character buffet price: Adults 25.99 Children 16.99
During the week Breakfast buffet price: Adults 23.99 Children 14.99 (3-9)
The price includes Starbucks coffee and Orange juice.
They do also have a small menu if you don't want the buffet, but I think the buffet was great for the price.
More info here
https://www.swandolphinrestaurants.com/