This comprehensive sourcebook makes available in the original Latin and Greek the principal extant texts required for the study of the Stoic, Epicurean and skeptical schools of philosophy. The material is organized by schools, and within each school topics are treated thematically. The volume presents the same texts, with some additional passages, as are translated in Volume 1. A large annotated bibliography is also included.
The book is certainly very interesting, but as a reader with little to no background in philosophy, it is very dense. I might have to read it again in a few years to get more out of it.
In any case, the combination of original texts grouped by theme with analysis from modern commenters gives the book a nice sense of progression, with every chapter building on the ideas introduced in the previous one.