Good characters and not a bad plot, but it's the tangible sense of escaping to a magical, hidden world that brings me back to the series again and again.

The illustrated edition is fun for a re-read, with a few stunning, lavish pictures with colours and a print quality I've never seen in a book before. But many of the pictures are more run-of-the-mill, and don't add much to the vivid picture Rowling builds up in the text.