My boys aged 6 and 8 are really enjoying these books. This is the first devotional book I have bought for them to do on their own; they do it after I tuck them in, and they enjoy the activity page. They are varied enough that they won't get bored (codes, mini prayers to write, fill in the blanks, etc) all at their level.
This devotional is perfect for the young ones that have a short attention span. It is the first devotional that my son WANTS to do, (out of many), so that's saying something. I've already ordered "Gotta Have God 2."