Reading this book is a struggle. Working with it over an extended period is a struggle. Both are worth it.
If you're already aware of and ready to learn more of systems thinking and system dynamics, then this is a classic. But this is no pageturner. It requires hard thinking.
Get through it and it will change how you view the world around you.
Used as supplemental reading by Prof. Dennis Meadows, Thayer School of Engineering, Dartmouth College for Introduction to System Dynamics course, Fall 1978.