1) The book is a sci-fi fantasy, which presents itself as Soche, the proposed revision in English reads quite easily, the pace of activity moderate, there are quite preliminary declarations (time phenomenon hyperspace drive, Evolution of the Apes) which does not turn out too broad, so as not to bore the reader.
2) Although the book offers much less extent than various films, the original story is still very exciting and sometimes humorous ("Oh no, you are just too unattractive!"). The final twist that requires only a few sentences, leaves nothing to the end, and is thus one reason for the huge success of the entire movie franchise.
3) The act itself makes leaps in time (space-time continuum), but from the perspective of the protagonists linear and presents a clear sequence of actions. It begins with a trip to a distant exploration dignified planet that is inhabited, among others, of people, but is dominated by intelligent primates. Remove both species, compared to Earth, thus perverted roles. As a reason for this, but for underground human unusual, Evolution is the uneven rate of evolution suggests that progresses substantially faster in the case of primates.
4) This hypothesis is confirmed at the end, after the rest of the team for the trip to Earth returns are (which have passed on Earth several hundred years), and this finds ruled by apes.