I suppose your satisfaction with this biography depends on what you expect from it.
Anquetil retired before I was born, so my knowledge extended no further than his being the first five time winner of the Tour. This biography, provides a basic grounding in his accomplishments, motivation, attitude and palmares. As far as I was concerned it served its purpose. I'm not sure, however, that had I a better base knowledge of Anquteil that this would have contributed a great deal more.
Given Anquetil won over 180 races; 5 Tours, 2 Giro's and a Vuelta, had Howard gone into great depth about each race the book would have run to over 1000 pages, but I can't help feel he stopped short of providing enough detail to satisfy everyone.
Given the jaw-dropping life Anquetil lead on-and-off the bike, and despite providing me with all the information I needed, I can't help feel this could have been better.