I chose this guide among the various other options available at the Uffizi gift shop (Mar 2017). I quite like the smaller format of the book, which despite its size, contains a ton of information.
The guide lists various works presented in the gallery by centuries. At the start of each section, there is a brief description of the new era and its influences. From then onward, there is information regarding select paintings, why/how they were commissioned, explanation of the paining and how it arrived at Uffizi.
More detailed descriptions are provided for certain paintings, which are considered today as the gems of the gallery.
I quite enjoyed the guide, and the 640 pages flew by quite fast. Perhaps I would have preferred less descriptions of religious paintings, as they seem to overtake most of the volume, while walking through the gallery I saw many interesting compositions on various topics.