The author is amazing. The whole book focuses on intuition behind every formula. Usually, the formula/math and its explanation in a statistic book are more than 50% of the content. But in this book, the text for explaining the notion is more than 80%. Yes, it's so easy that a graduate student can read the whole book in a week and capture the concept of statistic. As a researcher, I never take a statistic course but I do learn statistic from practical experience and Wikipedia by myself. Should I know the book is so great I will buy it earlier. However, for serious reader... be careful this is a book for explaining the notion behind the statistic concept. It's a great book for a novice to statistic, but it is NOT a complete reference for statistic. If you are looking for a book that help you to catch the intuition of each statistic conception, you are in the right place.
I believe this is a must-have book for anyone who thinks they have to learn statistic. It is always a good idea to know the notion behind a thing before memorizing the formula for the exam. . The book is filled with examples to explains the notion. If you are somehow like me that know a lot "pieces" of statistic but would like to assemble them into a big picture. The book is great resource because it is easy to follow, and intuition-first style in writing. If you are a person who is already familiar with basic statistic, you might find the book too easy for you though.
In a word, this is a book to teach you the concept of statistic through "human language" but not science notation. It's sort of informal but somehow you are just like attend the author's lecture without really being there. However, this is an intro-level book, and might not a good resource for reader looking for advance statistic approaches or proofs.