We had dinner there in January, and liked it. It wasn't the greatest meal I've ever eated in WDW, but I do enjoy eating in the castle. We were in there about an hour.
After you enter, you get a picture with Cinderella, then you're called upstairs for your seating. During dinner, Susie, Perla and the Fairy Godmother come out, sing a song and walk around. My daughter got a picture with Susie, but not the others - it's not like lunch where they come to your table for a photo.
The berry sorbet is wonderful.