I will first admit that I am not completely unbiased as I contributed one chapter to this study.
The study -- commissioned by the Universal Autograph Collectors' Club (UACC) - is quite comprehensive and includes contributions from a wide range of respected figures in the autograph collecting hobby. It has a multitude of authentic signature examples and will be helpful to any collector looking to learn, authenticate or purchase a Neil Armstrong autograph. It also includes a good deal of narrative and biographical information on Armstrong.
And it is a real "book," not a flimsy pamphlet. I highly recommend this as it belongs on the reference shelf of any serious space or autograph collector.