Solid, concise, up-to-date and critical introduction to the classic Persian, the Parthian and the Sassanide empires. Only one minor point of critique: when Brosius writes about the Persian religion she could have been more prudent about Zoroastrianism; most of the things we know about that religion date from the later Parthian period (some 600 years later). For instance: the god Ahuramazda certainly was thé reference-god for the Achaemenid kings, but the name of Zoroaster was never mentioned in Persian sources; and the impression is that the typical dualism (/manicheism) of this religion is something that was more pronounced in a later phase.
This uncertainty is a problem with almost all early religions (Hebrew faith, Confucianism, Hinduism, etc): the texts we have of them are centuries younger than their origins, which leaves a lot of room for speculation and false representations. Unfortunately even a lot of academic works sin against the prudential principle and present versions of early religions in the form they evolved into only centuries later. There's still work to be done!