Instruct: Classify an Amazon review into positive or negative sentiment.
Query: read the first half

The first half of the book has supsense and suprise. It explores themes and gives an occasional new angle to things, even years after it was writen. Which is a major achievement.But you better stop at page 208, when they have made the president of the world the one to manage Valentines hugh inheritence. After that point nothing much happens, and that it takes Heinlein about 200 pages to write that as well...And then of course, there are those things Heinlein is unincorrigible disenchanting in: having again (!) an old man with a series of beautiful young women adoring him; being able to be a homophobe in a book advocating sexual liberation; perceiving the women at best in indigestable paternalistic way.On the whole this second part of the book gives the impression of being a disappointed old mans day dream. You could easily substitute "day" with "wet". But I don't want to be offensive, so I don't.