Good...if you can get through it. A significant majority of my formal education is in physics and this book is definitely interesting if you have the background...it would be a daunting task if you did not (unless you REALLY wanted to learn). The book has it's share of 'a-ha' moments and plenty of stimuli for further contemplation. Yes, it comes full circle and leads the reader to conceptually amazing insights about our physical world...or rather, our individualized creation thereof. It also leads the reader through the historical processes/experimentation that have gotten us to where we are today. It also leads to interesting insights of the direction(s) that physics of the future must take. However, and this was a BIG however for me, getting through it...well, the only way I can describe the process of reading this book would similar to someone in hip waders trying to traverse the Atlantic ocean...if it were filled with molasses instead of sea water. I would give it 5 stars for the content and the format. I would give it 2 for the deliverance thereof.