I have used many of these for my grandchildren's genealogy. I do two books per grandchild so that they will have both sides of the family and go back usually 8-10 generations each. The numerical dividers that fit this binder works perfectly.
So far so good. I bought this binder to replace one that was falling apart. I don't think this binder will have the same problems. It's sturdy easy to use and isn't going to fall apart like the cheaper plastic/cardboard binders.