I appreciate the information and what Marilu is attempting to do. However it doesn't come together very well.
Marilu spends a really long time talking about how important it is to remember things. How it helps in making future decisions, how it's part of who we are, how it can be fun to revisit old memories. It's understandable that she wants to argue in favour of it as justification for the book and her passion for remembering stuff really shows.
However she totally oversells it. She writes things like "Memory is everything" and memory is what makes us human - when obviously there is more to life than memory. A computer can hold things in memory, that doesn't make it human or worthy of adulation. She is a bit full of herself and self-congratulatory in this respect at times. Memory is only one aspect of performance and living. What is the point of having countless memories of things people said or did if you can't fully process them and carry out the results to benefit in your own life? At one point near the end she indirectly mentions how nobody can win an argument with her - as if every argument was about some fact you're trying to recall!
In another part Marilu nonchalantly mentions how in a certain sense autobiographical memories in our head are the exact same as video files on a computer to be played when we want - and I thought yeah that's a very interesting point. Just because you remember something doesn't mean you have any better understanding of it. We could all go around wearing cameras recording everything if it were that important. What is useful is the highlights, the important bits, that's how memory is supposed to work.
The way people become the best in the world at things is normally through both amazing talent and amazing training/practice. HSAM individuals are known to spend a lot of time reflecting on their past and they have large parts of their brain that are characterized by people with OCD. One of this book's strengths is in how Marilu explains this part of her - how her autobiographical memory developed over the years. It's quite fascinating at times but there probably isn't enough of it to last a whole book. I really appreciate this information and to understand some of the passion Marilu has for her autobiographical memory and it's to some extent infectious.
However whether or not it's worth doing all the exercises and implement it all is quite another. Sometimes she says things like "most people can remember this" or that or whatever, and that may be quite true for MOST people. However she is alienating the half of people who fall below the average memory ability, and those are the ones who need the book the most. I did feel alienated on a few occasions, particularly with the strong propaganda Marilu was also putting out about how important memory is to be a real human such as herself excels at. Rule #1 of being liked - don't insult your target audience.
Later in the book she talks about making a journal of what happens in your life, and she advises to break it into anticipation, participation and recollection. Some of these ideas I like. However it all takes time and effort. Another thing is that when you write something down or record it some other way, it's like it becomes something else. You lose a part of the memory of it. No prizes for remembering something if you just wrote it down and have been looking over it every day, that's not really developing your memory.
By going over what happened again your autobiographical memory will no doubt improve but at a cost of time and effort. Unlike Marilu Henner people with significantly below average memories cannot afford to waste time or neurons on things that aren't important. Marilu Henner strongly claims that your brain will become better at this over time and do it automatically, but every time you're randomly revisiting the past you're using up your brain from what it could be doing right now. How is this going to help when you see someone you should know but you don't recognize them or remember things about them? The book has no answers to this.
In some ways you are being sold a lie. There is little or no evidence anything in the book will make you remember better because if it could everyone would be doing it. At one point Marilu talks about turning up how much "juice" you feel in your life and trying to be more excited about mundane things so then they'll be memorable, farcically claiming that maybe this is the entire reason for HSAM even though she knows it's not as she said elsewhere in the book. The only advice that really seems to stick hard is to revisit old memories if you really want them to stay with you, which comes at a cost, and which people create their own strategies for doing automatically to compensate for their memory not being as good as they wish. It is hard to show any real benefit from reading the book after having read it.
I didn't know if it was just me at first but the book really starts to drag the more it goes on, especially the second half. Near the end Henner does a chapter on teaching others the methods, then a chapter on lifestyle and diet, which is fine but not something I think I need more information on, and a finishing note by her husband on how great she is.