Our teachers on Wednesday evenings have a mixed age class and really like this series of books. it gives a Bible study and activities that can be adapted to several ages in one class setting. If you're in our situation, you will be pleased with this set of books.
This is an excellent children's church curriculum for a small church with a variety of ages. It is biblically sound, easy to use and fun. It also doesn't just use the biggie stories (creation, Noah, David and Goliath, etc). Our kids tend to be pretty well churched, so we need either fresh takes on the oldies-but-goodies or different parts of the bible. Our church's children's ministry has unfortunately diminished dramatically, and we never know who will be there on any given week. This curriculum is generally easy to prepare for, and truly works for ages 5-12. My only regret is that there is only 1 year's worth. It also is inexpensive, which is an added bonus.