Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A Classic

This is a fantastic novel. It truly is a page-turner. I've read a fair amount of science fiction in my 43 years, and this is one of the best.Although it was written in the 50's, there is absolutely nothing dated about it. It takes place in a far future, involves intrigues in a military-industrial complex fighting a Solar System-wide war, and yet is a very human story about the failings of men and women of any age. I highly recommend it.