We did it when it was pretty new back in January. It was an ok experience. Food was good and character interaction at the table was good, however, the Menehune "show" was chaotic and hard to follow. Uncle tells a story that gets broadcast around the restaurant. It was often hard to hear and because you are up and back getting food you ended up not really listening and missing half the story. There are a couple of parades of kids going around the restaurant which makes it hard to get food as parents are following their kids recording the whole thing and it gets congested. For me personally, when we go back I'd rather do the character breakfast instead.
ETA: Just asked DD11 about her take on it and she thought it was good. She liked the food and the characters. She did agree that it was hard to follow the Menehune story.