It is not easy to write a better, very short introduction that Stillman Drake has done, here. While being absolutely packed with loads of information, Drake makes it accessible. This book will be intimidating to someone familiar with the watered-down nature of other introductions, but, having read half of Oxford's series, I think that the idea is that these books are intended to be scholarly approaches to introductions of the material. To put it simply, as an academic who is not familiar with many other disciplines, I have found Oxford's series to be quite useful. At any rate, Drake's work, presented in this book, I think, is so accessible that, even for the non-academic, a brief introduction to Galileo, such as the graphic novel variety, would suffice in one's preparation for reading this. That is to say, though a step up on difficulty, Galileo: A Very Short Introduction serves as a fantastic introduction to a subject, especially, in cases where the reader wants to know if the subject is one worth reading more into. As for me, not only will I be reading more into the subject, I have found it rather obvious that Stillman Drake is probably among the top, if not the top, scholar on Galileo.
One thing definitely worth noting about this book is its interdisciplinary style. Drake does a wonderful job of conveying the science that is relevant to the history of science discussion, as it pertains to Galileo. Moreover, Drake does well to explain the importance of various philosophical aspects that impacted Galileo's science.
Finally, I think the book was just well written. Drake has a definite writing style, and he has a flare, which really brings interest to his subject matter. He writes with clarity, and he writes in such a way that provokes thought. Probably, the best part of his writing is the way in which he words his thoughts, which is brilliant, in that he says so much in such a small book; not a sentence is wasted.