We've been looking for a good "churchy" book to keep our 2 1/4 year old occupied and "on track" (tractors, trucks and cars just aren't that spiritual!) and this one is great - SO many flaps that it keeps him going for a good long while before he starts demanding to "go home".
He can now recite the entire book which has nice simple language, unfussed and easy to follow, plus the detailed pictures of the fabulous models (I wonder how long it took for them all to be made...) allow for additional in-depth discussion as to what is going on "behind the scenes".
I wouldn't recommend it for much younger toddlers or those who are not good at opening flaps - they are small and can tear if not handled with a bit of care, although the quality of the paper is excellent, a bit thicker than some of the books we have bought and it would need a good yank to do real damage.
If you want a good, simple, fun and pleasing (especially the shiny angel pages) book I would really go for this one!