My 2 oldest kids (grades 5 & 7) are using it this year and really enjoying it. We are using the newest edition (so instead of "World Book" it uses "Journey to the Eastern Hemsiphere") and I love having a book as a spine instead of the computer, especially because they share it and work together to answer the questions on the notebooking pages. The missionary stories are fantastic. I proofread all the readers and I'm very glad I did. If you don't want to introduce other faiths and beliefs to your children, then do not do this core. A lot of the books have main characters who are decidedly not Christian in their beliefs or actions. We have had a lot of good discussions about this and been able to look at the differences in beliefs between various religions (the notebooking pages also ask questions to help kids see the differences). I view this as a positive but not everyone has the same viewpoint :) My youngest 2 (ages 8,6) have sat in as we read all the read alouds and also loved them (hopefully they won't remember everything when they repeat them in a few years!). Overall, it has been great and I have learned so much too!