Doesn't do the book justice. Some of the changes are understandable given the short runtime, but completely changing the ending ruins the point of the analogy.

The book is really quite short and very enjoyable, don't substitute it with this film.

From IMDb:

wrote:A large portion of the budget ($300,000 out of a cost of over $500,000) was supplied by the United States' Central Intelligence Agency, Office of Policy Coordination, through one of its shell corporations, Touchstone Inc.

Good movie.