This book has been great exposure to new vocabulary and grammatical constructions. The familiar storyline helps a lot with context clues, and the audio helps to get native phrasing right (although I do find that the “normal” speed is plenty slow enough for me to get all the words, I appreciate the effort to go super slow for us learners). I feel like even getting passive exposure from the book helps a great deal because often I run into the words or phrases later in my lesson – and because I’ve seen them before, I remember them this time!