This is absolutely an excellent textbook to introduce students into, and master the basics of, the field of high-dimensional probability.
Chapters 1-7 are most well-written and nicely structured. The later chapters, such as Chapter 9 and 11, are a bit short and less elaborated, giving an unfinished feeling. This is a bit disappointing, because the author is a geometric functional analyst and I was expecting more geometric functional analysis could be discussed in those later chapters.
The overall writing of the book is concise, without a lot of details. Thus, beginners are strongly encouraged to do all the exercises (especially the one-star and two-star ones) in order to have a better understanding of the content and the details. Three-star exercises may involve useful tricks and can generally be solved in a reasonable amount of time (with a certain degree of math maturity). There are also a few four-star exercises, such as Exercise 3.4.5, 8.5.6, 10.6.11, which are absolutely challenging for beginners.