A plethora of recent books chronicle recent Iranian history (with a particular focus on 1953-today). This book discusses that period, but it does a lot more. The vast majority of the book deals with ancient Iranian history - including tales of epic Persian leaders (Xerxes, Darius) and the wars that shaped Iranian history (fighting against the Greeks, Romans, Arab Muslims, Afghans, Russians, and the British). If you want to know about ancient Iran, this is your book. It's very easy to read for a "history" book.
That said, if you are looking for real detail on more recent events, such as the 1953 Mossadeq coup, the 1979 Revolution, or today's affairs, I'd look elsewhere (Persian Puzzle is really good at narrating the recent events, as are focused books such as "All the Shah's Men" and "Ahmadinejad."
Having read a lot about recent Iranian history, I enjoyed the voyage into ancient history - but know the predominantly ancient focus before buying.
As noted, the author's style is easy to follow and enjoyable. He even tells a few jokes. The book is generally even-handed, though he did seem to soft-pedal British mistakes in the region (understandable given his nationality). My only beef with the author was his 20+ page expose on Iranian poetry. It comes from nowhere, and it was boring (though, admittedly, I am not a fan of poetry). The book is cruising along finely, all of a suddent takes a detour into poetry, and then corrects itself.
Overall, this is a great book and a must-read for someone interested in ancient Iranian history and the events/people that shaped a country sure to be in the news for a while.