I've used an Open Bible since the 1970's when I received one as a gift. I've worn out 3 of them to date and given them as gifts to many friends & family members since. They all comment on how they love the Cyclopedic Index and how it helps to understand what they are reading. The study notes mingled throughout are almost as good as a well-spoken sermon. I've found myself lost within these pages for hours at a time!