We went for breakfast and loved the atmosphere. The inside of the restaurant is very castle-like. You should get to meet 5 princesses (or leading ladies). It varies - there's no guarantee for any particular character. Going by the posts I've read, Belle is usually the greeter - but there are exceptions.
We saw Belle as our greeter - and Aurora, Ariel, Mulan and Snow White came around to the tables. They mingle through the restaurant - stopping at each and every table to chat, sign autographs, pose for pictures - whatever you like.
We thought it was great. We got to meet 5 princesses, have a good meal and the atmosphere was very relaxed.