The most significant part of the title of this book is the second part: "Complete and Unabridged". There are very few complete works of Philo and none at this inexpensive price. There is a very cheap Kindle edition, although it is not the complete works. There is also the Loeb editions in 10 volumes with English and Greek parallel texts.
Considering that this is the complete works, this book is physically very manageable and the fount is easy to read and not too small. It has 897 pages of text plus a Subject Index, scripture Index and a section of maps.
Philo of Alexandria lived from about 20 BCE to 50 CE and was an important Jewish writer, but he is not as well known as his younger contemporary Josephus. Philo was a devout Jew who was heavily influenced by Greek philosophy, notably Platonism. Many of his writings are biblical paraphrases, such as "On Abraham" and "On the Life of Moses". There are more philosophical works such as "On the Eternity of the World" and "On Virtues" but there are also more varied writings, for example "On Drunkenness", "On Sobriety", "On Dreams" and "On the Embassy to Gaius", where Gaius is beater known to us as Caligula.
He is often read as part of New Testament studies as he offers an independent view of Judaism in the Greek world at a time when the New Testament documents were being written by Jews in Greek in the same Hellenistic world of the eastern Mediterranean.
Philo is a very exciting book. The fact that it comes from an educated contemporary of Jesus and Paul is sufficient as a magnet for the reader who is interested in ancient Greece and the Levant. The book is complex and requires some prior knowledge of the Bible and other actors of that time and that part of the world. Very exciting.