I owned a couple of these books growing up and borrowed the others from the library multiple times. I've always wanted to own all 7 books, and now I have then all in one volume. This volume contains all of the original illustrations at the beginning of each chapter (at least, these were present in the other single volume editions I have read). The books are ordered chronologically (in the Narnia universe) as opposed to the order in which they were published. I personally prefer reading them in publication order (specifically, reading The Magician's Nephew towards the end).