I really like these altho, I don't really seeing being able to add more then say 2.. 3 pages at the most to each book. I bought 2 sets of 12. They look nice on the shelf, I did have to work with them at first to get them to stand up correctly because they were leaning pretty bad at first. I LOVE being able to have two shelfs of DVDs in books vs. the hundreds on dvd cases that took up a whole wall. WOULD BUY AGAIN!