The original book by Charles Darwin is a classic that should be on everyone's reading list. There are ample reviews here which address it, praise it, and I am completely in agreement with them. Darwin's Origin of Species is a true masterpiece.
Unfortunately, this review is to help readers/buyers realize that there is a 'vandalized' version which has been published, and to tell you how to avoid it and get the real thing.
To explain; there is yet another edition also called "The Origin of Species, 150th Anniversary Edition", put out by Christian Fundamentalist Ray Comfort in an attempt to discredit evolutionary theory and Charles Darwin, and it has some extra 50 pages of unintelligible drivel about creationism, as well as having ABRIDGED Darwin's original text. If you want to read about creationism, find another book... if you want the facts, read ALL of what Darwin has to say, and please don't give any money to Comfort by accidentally buying his ABRIDGED version.
Note that he used the EXACT same name as the 'real' anniversary edition -- "The Origin Of Species: 150th Anniversary Edition by Charles Darwin". You can easily tell which version you're getting by who wrote the introduction - go with Julian Huxley, NOT Ray Comfort, and you'll have the correct and complete version.
Also, note that Amazon reviews are mixed between the books (normally not a problem at all) - I hope they are straightening this out, but currently that's not the case. Sadly, the negative reviews of the Comfort version are bringing down the rating of the 'good/real' book.
Sorry to have to write about the 'drama', but I'm sure you want to know that you have ordered the correct book, and I know you'll love it.