Poorly written. The syntax is easy to read but it's long winded. I skip over the equations because they're too hard to comprehend, but the author does not seem that bright; he struggles with what "evolution" and "natural selection" conceptually fundamentally mean, and he claims that the existence of sexual reproduction is an evolutionary mystery.
I have read a third of the book (200 pages- I'm a slow reader) as my principal activity for the last two days and intend to finish it, only skipping occasional short sections.
I've read a tiny bit of Futuyma's Evolutionary Biology and anticipate that it will be better (the text is a bit less "matte"; Evolution is easy to accidentally gloss over without it making an impression on my mind). It's supposed to be more advanced, but it's about the same length- the only difference I see is that the format is less fancy and attractive.
This book is probably good for more technical people. Despite his flaws, the author is obviously very well-versed in his subject. His References seems impossibly long. It has 33 pages and packs 30 papers per page- that's 3 pages of very tightly listed citations that have authors whose names start with H. How did he read all that?!
*The full text is available for free online.
**There is a good website pairing with this book with free access, that you can look up individual topics and vocabulary on.
***The author denies climate change (outside this book) and disagrees with group selection. Judge as you will.