I saw a similar post 5 months ago or so. Decided to give it a try. It's been really surprising just how effective it is. I've been able to heal so much emotional baggage and trauma that was weighing me down, I'm much better at dealing with negative emotions (Low Vibration Energy) and experiencing a lot more of positive emotions (High Vibration Energy), and I'm starting to move away from the need to intellectualize to make sense of things, which is still useful in some cases but is also very limited, time consuming and energy consuming.
In the last couple of weeks, I've been having mystical glimpses. Moments where I go deeper within and the "outside" gets seen as inside, where I can look at another person, and be directly aware that I am actually looking at myself. There is still work to be done though, since there is still a sense of "a self" looking
I'm feeling more and more motivated to do the real spiritual work now, or more accurately I've let go of a lot of the resistance to doing what I actually want to do and actually brings me joy in my life Videogames, TV shows and things like that just don't really do that much for me anymore. They never really did, I was just carrying to much shit to see it.
Anyway, I could go on and on, this is just the tip of the Iceberg of my experience with the letting go process, but I got work in 2 hours and I have some things I want to do before I go
TL;DR - 10/10 Book. Life changing.