This is a great intro to some key physics concepts. However, like a chain of undersea mountains, all you get to see are a few peaks rather than the underlying structure. It is made clear that this is merely a selection from the much longer lecture series and thus it lacks a narrative flow that most popular science books aim for. I enjoyed it thoroughly because I had some familiarity with the material covered and Prof Feynman is such an entertaining lecturer. That said, I think that if you are looking for a good introduction to physics concepts, you'd be better served by a more complete book