One day I gave myself the task to read this from start to finish. Since the textbook is very big and contains a lot of information, it took me a long while to finish reading it. After reading all chapters and further researching concepts and facts that interested me, I can say that this book is an amazing foundation of what biology is. It gives a good amount of information on the most important biological concepts and branches, and the pictures and examples are shown are extremely well taken (Thank you Nat Geo :) )
The only negative aspect I found about this book was that it delved a lot more into the DNA and genetics chapters as opposed to other interesting chapters like the last ones (medical and body-related chapters). I mean it makes sense that this book would focus a lot on DNA, after all it's the building block of life, but I still felt like they could have tried to balance this a bit more.