I'm not a William O. Douglas scholar, so I can't really compare this book to others regarding or by this influential, Washington State born, American.
However I did find this particular collection of well introduced writings both entertaining and educational. O'Fallon takes a broad selection of his writing ranging from commentaries on the fly fishing advice of Izaak Walton to Supreme Court opinions regarding civil rights in the 1960's. His stories of growing up in the NW are also worthwhile.
Douglas was not without flaws - you could say he epitomized the cliche 'Soviet State of Washington'. You could also say he was a womanizer and I'd bet drink had an influence on his life. But he was very definitely very much a man of his times and his influence is still with us today.
Mr. O'Fallon is with the University of Oregon Law School, recognized as one of the nation's best on the subject of Environmental Law. I highly recommend this book, as well as the near Seattle William O. Douglas Wilderness.