The film was well done on the whole, and the acting was good although some of the plot elements were improbable. As a science fiction buff, I left the movie somewhat unsatisfied, thinking "I've seen this plot before." The plot appears to be the major feature of the movie, but the plot as it stands alone, fails. I was unsatisfied that other more subtle ethical and sociological themes weren't better drawn out.
From the trailers alone, science fiction buffs will easily recognize the plot as a variant of an oft-used time travel theme. To experience the definitive use of this theme, I suggest the reader obtain a copy of "The Lathe of Heaven" by Ursula K. LeGuin, which uses the plot (correctly) merely as an element to draw the reader into serious ethical and social questions.
From the trailers alone, science fiction buffs will easily recognize the plot as a variant of an oft-used time travel theme. To experience the definitive use of this theme, I suggest the reader obtain a copy of "The Lathe of Heaven" by Ursula K. LeGuin, which uses the plot (correctly) merely as an element to draw the reader into serious ethical and social questions.