Instruct: Classify the given review into positive or negative sentiment.
Query: Pivotal Heinlein?

This is a highly curious book. As SF it is very much dated: the "science" is ludicrous by today's standards. Despite the comments of other reviewers there is not really all that much politics in it. I have reread this a few times (one of the few books that allow this) and find it gets better each time I read it. I feel this is a book that very much expresses Heinlein's philosophy, and can hold its own beside "Space_Cadet" and "Starship_Troopers". The one-dimensional young female character so typical of Heinlein's later work is here, but in reasonable proportions (I will go with the mainstream view that Heinlein never wrote anything worth reading after 1961). I guess this indeed is a classic although it is full of laughably silly little details.