I found my attention wandering often. The film focuses on her life story, told by her voice, usually over simple pictures and with only occasional video in the first half of the film. About 10-15 minutes near the end of the film focus more specifically on her philosophy, including a greater density of interviews, which are consistently more engaging than the earlier component of the film. Overall this film was fine, but certainly not spectacular.
As a substitute, I'd recommend Ayn Rand - A Sense of Life. That film covers much of the same material but is better composed. However, some may say "In Her Own Words" is preferred since it is basically all literally in Ayn's own words and voice.