In this book, you feel actually how to think about the universe not only the physics! (i mean generally in our textbook we know from starting that what we are going to study because textbooks have already mentioned topic like "first law of motion" & then we read the law that-it States that bla.bla.??.) .In this book we understand how the old theory rejected by upcoming theories step by step like rejecting the concept of absolute time & promoting the concept of absolute speed of light & Many more.
In the starting we find easy to understand but later we face difficulty therefore revising previously studied chapter is must to proceed, this will help in clear visualisation from the previous concepts.
Now I personally completed almost half of the book till now although the book is very concise
& Can be completed in 2-3 week easily.