It has helped me attain the deepest level of meditative state, where I am almost aware of my consciousness as a separate process from the constant sensory input. Becoming an observer, empty-head.
On another level, I've found it very settling in times of emotional turmoil.
I did have a near panic attack from the book when he makes somewhat of a case that both hemispheres of our brains might be independently conscious, with one permanently silenced as control of the body is held by the active one that controls our body. A prisoner in someone else's body, literally, with no way to interact with the world. It is pure physiological horror. But alas I cannot do anything about (other than try to talk to that other entity and see if it can trigger some sort of response?) so no use getting worked up? The world is full of day-to-day cruelty and it's not my fault.