If you are reading this, then you are probably already familiar with Professor Noam Chomsky's writings, so rather than re-cap his work, I will offer only a few salient points.
This is Chomsky's most well written book in years. It is a small irony that a professor of linguistics has often authored books that can be quite badly written - Year 501: The Conquest Continues, being a prime offender. This isn't dumbed-down Chomsky but rather this book feels as if Chomsky has taken much more care in making this book accessible to a wider audience and not just his hardcore fanbase.
Secondly, as usual with Chomsky's books, he recapitulates his own work quite frequently (to phrase it generously). Hegemony or Survival is no different. About half of this book is fresh material and half is previously published.
However, this book is most definitely worth purchasing, even if you have Deterring Democracy (probably his best) because it covers the years 1993 - 2003 (approx.) with his usual insightful prose. Though the book covers outside of this timeframe, looking at the Cuban Missile Crisis or Israel and Palestine, for example, Chomsky is at his best in this book when he is being contemporary. The parallels he draws betwixt Clinton's bombing of the Sudanese pharmaceutical factory and Al Qaeda's bombing of the Twin Towers is fiercely provocative and yet thoroughly underpinned by diligent research and logic.