Not a great museum, but if you love chocolate, I mean can't go without the stuff, then it's good for you. My wife liked it better than I did. You did get some chocolate at the end, a piece of small chocolate.
Compared to the Callier Chocolate Factory in Switzerland, this is a poor experience. Instead of going to the museum, spend the money for tickets and go to Dumon and get the best chocolate in the world and talk with the ladies behind the counter. You'll learn more about chocolate and enjoy the best butter-cream filling at Dumon!