I was very skeptical of using Apologia for high school. But I finally took time to really check out the text and I compared it with my college biology book, as ChandlerMom said, and I found it just as challenging and detailed. I don't feel my son missed out on anything. He did learn enough about creationism to hold his own in a debate or discussion about his belief in evolution. I believe it is important to know both sides of an issue, especially one such as this. For the module, I believe #9 that is all about creationism, I added my college text chapter on evolution to balance it. Plus, I have to agree Apologia is very user friendly. The only thing I changed was I created my own study guides.