I'm not sure what you define as a 'working' knowledge of Physics, but to get to a research level of physics requires more than a few introductory physics course

I'm not sure what you define as a 'working' knowledge of Physics, but to get to a research level of physics requires more than a few introductory physics course also. I'm not saying the Feynman lectures is a substitute for learning any specific part of Physics, but it is useful for understanding basic concepts and also understanding how those concepts can fit in to our everyday lives. What I disagreed about in the post I replied to was the position that it wasn't "intuitive" or a good first text for beginners.