Historical MileStone. - Rated 
This book has a historical value that exceeds whatever cons it might have.
It is a book that explains Relativity by Einstein himself, and not an interpretation by any scientist! That alone makes it a MUST-READ.
Some people criticized for being hard to understand, and bad written. Well relativity itself is a mind-bending theory. Especially if you dont simple state the facts, but you follow every simple step to prove it, and reach conclusions. It could be better written, but it wouldnt make a huge difference and in addition it doesnt reduce this book's value a bit. Must have in your library!
The Relativity of Expression - Rated
In this work Albert Einstein elucidates his General and Special Theory of Relativity in a manner relatively (Ha!) devoid of complicated mathematical jargon. It is not a book for an absolute beginner. A familiarity with basic geometry and physics is necessary to understand the concepts put forward. This is not an "Introduction to Relativity". It is the Theory of Relativity in words, rather than mathematical symbols. It is not an easy read for those with little mathematical ability, but it is a rewarding one.
The single most original idea a human mind has every created - Rated
If you dont know why Einstein is famous this short book is the reason. In it he outline that time is not constant 1 year for me is not the same as 1 year for you (depending how many plane trips you've made) and time can in fact stop completely. I can here your mumblings of disbelief, just scientific mumbo jumbo?, How can you stop time?, how can you ever prove you can stop time?. What makes this work so impressive is the now 100 year old mountain of experimental observation and rigorous testing that have proven every theoretical prediction in this book exactly right. Why is E=mc^2 because if your were travelling at `c` the speed of light, you could cross the whole universe in 0 seconds, 100 times if you like, still only take you 0 seconds. Therefore if your mass is travelling at the speed of light like the formula says you cant carry any more potential energy, your travelling at an infinite number of (mph). Don`t believe me reed the book.
A uniqe conversation with one of the greatest minds of mankind. - Rated
This book is an excellent example of the fact that nobody can explain a theory better than it own creator. The main characteristic of Einstein's text is the clarity succeeded through brevity which renders this essay a terrific non technical introduction both for Special and General theories of Relativity. Some chapters dealing with the notions of space and time have a more philosophical approach but the rest of the book is pure physics. The usage of mathematical formulas is negligible and confined only to the Appendixes something that make it accessible to the layman. Even though the writer claims that this text is intended for the layman, it is a terrific source of knowledge and a fresh breeze of ideas even for physicist themselves who I believe must surely read it. Einstein's vivid style of writing comes from the fact that through his text it is as if he is directly talking to the reader. I dare to say that this small book which I've read multitude of times and each time with greater joy, contains the most crystal clear exposition of the ideas and needs that gave berth to the two theories which are unanimously considered to be as the jewels of human thought. If you don't have a deep knowledge of physics and you want to get an idea of what Relativity means then before you buy anything else, I recommend this book by heard.
He wasn't a genius at everything then? - Rated 
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Looking for a clear, simple guide to relativity? Then read something else. I don't doubt the quality of this book if you're of the required intellect to understand it, but it is not a casual read and will disappoint the layman hoping to gain some insight directly from "the man". The maths is useless to the casual reader and further complicates an already unfathomable book
Either it does not translate into English well, or Mr E did not know how to comunicate with idiots like me :o(
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