Most of the parents I know who have tried it with their kiddos have had good experiences. (I really wanted to use it, but sadly, it didn't come out until most of my children had passed that point, and the one child still in the range at the time dislikes cute curricula--that's my "just the math" kid!)

Glad you've found something your DC enjoys!

...pronounced like the long vowel and first letter of the alphabet...