I had a lot of fun when I went with a group of people. A great time to go for free is on Tuesdays from 2pm to 8pm. A lot of the exhibits were free and worth watching if you want to keep children occupied and busy for a couple of hours.
At the time I went, they had the chocolate gallery but since we didn't pay, we weren't able to go. It looked like it would have been fun to watch though. I think that if you come with a positive attitude and with a good group of excited people, it's worth the money if you were to pay.
Just be sure to call the museum first to see what time it's open and also for what time each exhibit is open and when it closes.
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