I like the glossary, and personally, all my series in the future will utilize it. My BIAW already has it. It's kinda a double-edged sword though, because it can contain spoilers, thus I added a spoiler warning as a first entry. But well, I think summing up how the character looks, behaves or other details is pretty handy when further into the story you don't want to browse through the chappies to find the description.