We just ate there a couple of years ago, and they did have a children's menu. That being said, it was more "fancy" kids' food, and my daughter didn't like her salad (she likes more plain salads) but did like her entree (I forget what she had). My son chose to order adult food (he got a filet of beef). It was a great restaurant for my kids! The service was very attentive, and my kids LOVED it! It was relaxing for us, but be forewarned, I am sure our meal was well over $400, and that was two adults and two kids. We felt it was worth it! DH and I got some chef menu with wine pairings, and it was fun and interesting. When my son saw our smoked salmon appetizer, he asked if he could get some smoked salmon. The waiter appeared a few minutes later with a plate of it for him - very attentive! They were also great with my son's allergies to milk and eggs.
I think kids that like nicer restaurants will love it - it's a nice break from the hustle and bustle of the theme park. If you have kids that would rather grab some food and get back to the fun, then it may not be the best place. My kids usually love really good food and nicer places (yes, they are spoiled, their favorite place as toddlers was the Ritz for brunch).
Edited to add: I ate at the downstairs place once, or rather tried to. We left without eating, after over two hours. It was horrible. I am referring to the Bistro in my above comments!