This book is huge, deep, and thoroughly worthwhile, IMHO.
Ralston's main assertion is that there is a possibility, right now, to directly experience the true nature of who and what you are - what he calls Being.
What keeps each of us away from this experience is what I consider an interesting twist on the old Buddhist perspective of Self. Ralston claims that the drive of Survival motivates everything we do, think, and perceive. Survival started with the physical, but, as we are conceptual beings, has evolved into survival of any form - social survival, self-image survival, etc... Our bodies and minds did not evolve to directly perceive and experience things as they are, but instead to filter, interpret and analyze everything in order to relate it to our own survival. This "self" creates either positive or negative "charge" on every perception or idea and this forms the basis for motivating your actions. Of course, a different way of motivating actions exists - one of pure choice - which is beyond simple self-survival and is one of the main points of the book. A lot of the time "self" is just great and works fine for us. However, it is also the cause of all human struggle and suffering. Yet we don't and often can't make the distinction. The Truth is what "is" already - independent of our beliefs, assumptions, etc... (this last sentence had a big impact on me).
So, this is a quick and very incomplete summary of the "theory" parts of the book. More importantly, for me at least, were the practical parts of the book.
1. Identify and remove all beliefs, assumptions, cultural "rules", etc... They are completely unnecessary.
2. Don't fill up the void with any other beliefs, assumptions, etc..., including the ones in this book.
3. Direct the self-mind to identify that which is disingenuous, fake, insincere, or otherwise false in any experience you are having. This allows the self-survival process to align easier with it's own undermining
4. Contemplate. Contemplation is deep, focused questioning and is the cornerstone of this practice. It is not meditation but it is not 100% different either - from what little I've practiced. Ralston describes two types - a daily practice on the foundational questions (who am I, what is life, etc...) and a more situational contemplation that you take up whenever, often, and frequently on just about any subject. An example would be to find the underlying assumption or belief that just motivated your anger during that argument with your wife 10 minutes ago. Again, his assertion is on direct experience, not the generation of a good idea or a neat sensation in your dan tien.
The only con, possibly, is that the first 200 pages may be viewed as repetitive. In fact Ralston himself says the book is like climbing a switchback mountain trail - you repeatedly see the same view, but each time from a higher perspective.
It's 581 pages of small font type, about $25, and contains zero ad-copy and no reference to kettlebells.