Sir Arthur Conan Doyle's autobiography gives a fascinating insight into his life and career and is worth reading for any student of his life.
However, like anyone writing about themselves, Doyle tends to avoid discussing those parts of his life about which he is uncomfortable. Consequently he does not devote much time to his Holmes works which he considered less worthy than other parts of his life. For the reader however, Holmes is undoubtedly of significant interest. The book also contains the odd inaccuracy. For example, in discussing his brief turn as an eye specialist, Doyle gives us the incorrect address for where his practice was located.
So, in short, this book is worth buying for Doyle's personal perspective on his life but if you want more detail on Holmes and other areas of his life you would do better to purchase one of the many excellent biographies.