This book is a brief introduction to one of the most important figures in history. Rice uses simple words to describe Alexander's rise to power in Macedonia and his conquest in other continents. He does not solely praise him like many nowadays do, though. His view on Alexander the Great is quite mixed; on one hand he is, well, Alexander the Great who had achieved great things, but on the other hand he also seemed to have drinking problem and would not hesitate to kill those who were seemingly opposing him (although one can argue this is a common trait back then).
One major complaint I have about this book is the lack of map. It's very hard to visualize Alexander's route when places 2000 years ago are not necessarily the same as places nowadays. Rice only gives us a small map at the beginning and does not explain a lot in terms of geography later on.
If you want a very brief introductory material for this great figure, then this book is a good read. It's only about 100 pages and is not hard to read at all.