I enjoyed reading Einstein's thoughts about science. These are all written for a pretty general audience so anyone with an interest in science should be able to "get" them. OK, there were a few differential equations in one or two of the essays, but they are easy to understand and not needed to get the point.
I found the overlap in ideas with the other book from this series I have read - the one on Einstein the humanitarian - interesting. I think I understand the editors reasons for placing an essay in one book as compared to the other, but the overlap does exist.
It is also interesting seeing Newtonian physics as seen from the point of view of the one who replaced it. Fun stuff.