The instructor of the 1-semester strings grad course I am taking uses this as the textbook. This book is a good company to a course for its conciseness and fast track to superstrings. However, I don't recommend reading it for self-learning, as it skips a lot of details and subtleties. For self-learning purpose I recommend Polchinski Book 1 and then return to the chapter of this book on superstrings and beyond.