Hogwarts: An Incomplete and Unreliable Guide

I enjoyed the extra info, but felt it could have been so much more. Also not wholly convinced on the style, where it's partly in the story, but then partly looking at it from the outside e.g. “in the Harry Potter books”, and with extra info from JK Rowling herself. I was kind of hoping it was going to be written by someone from the HP universe, in character. Same applies to all three of the newly released books.