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The book is actually really good with how it explores and analyzes DaVinci's life and artistic choices. There are not many illustrations in the book, and the ones that are included are not of finished drawings. They are literally gesture and concept sketches - the cover is a little misleading. If you are looking for something that has more sketches, check out Rosalind Ormiston's books on Leonardo on Amazon. If you are only looking to get into the master's head, this book is pretty good.
[I bought a hard copy first, because I thought there will be more illustrations, but realizing that there weren't, I sent it back to Amazon and bought a Kindle version instead.
This work by Oxford Classics is not the complete translation of all notebooks by Da Vinci. It is just a selection. Might be boring to a normal reader. But it had helped me to know about 'Leornado the author' and 'Da Vinci the Philosopher'. It doesn't have a detailed account of his life, but includes his observations on most of the topics from Science to Bible...