If you are looking for a solid text book in the field of Political Geography, Mr. Glassner book is the one for you. Easy to read and well organized, a novice will get a lot out of this book. I would also recommend this book for those in the fields of Political Science, Economics and History for it lays out the fundamentals, of a significant school of thought, in 18th and 19th C Europe early state-relations. But, if you already understand the basics of Political Geography and are looking to expand your understanding of the origin, its under lying philosophy or the actors who developed and played a substantial role in the development of this subject -- save your money. For the serious students of Political Geography there are a couple of chapters that may be of interest to you but, only a few and it's not worth the money.
But what I truly believe is the best part of the book is the reference section at the end of each chapter. There is a wealth of information in the reference section for the student of Political Geography, which can prove to be invaluable when doing research.