Loved this. I had to read it during my Masters and it has become sort of my bible in matters of leadership. Very well structured, consice, and with up to date info and studies. Everything you would need a book of this nature to do, it does, and does well ! Because of the many (relevant) chapters and sub-chapters, one can read it like a sandwich: one bite at a time. It incorporates many of the major leadership theories such as the trait approach or skills approach, etc...but it also has relatively more modern ones such as: Servant, Adaptive, and Inclusive Leadership.
My favourite parts of the book are the "Leadership Instrument" part, which are basically questionnaires that encourage you to reflect on your own leadership style and behaviours.
I will for sure keep one in my personal library.