I plan on rewatching all the movies before the new entry comes out in May, and I figured it would make sense to read the book. I was fairly disappointed in this until about the final half, which redeemed itself. 

There's certain plot points I think the original film explored and explained better than the book, such as Taylor/Ulysse speaking to the apes. Somehow, also, Ulysse is somehow more unlikable, arrogant, and creepy than Taylor is in the movie?? Didn't think that possible, but here we are.

I knew going in that

in the book they are not revealed to have been on Earth the whole time, but this certainly has an equally compelling twist ending

Something I wish was explored more is the element of colonialism, which gets some lip service near the end, but ultimately is not a large part of the story. Rather, the book succeeds in drawing analogues to human treatment of animals. 

I liked it for the most part