I have read a number of reviews on this site and disagree with most. I have read nearly 330 science fiction novels and with the exception of a few you can pretty well see what is coming. This movie was a delight in that the end was never obvious until you experienced the climactic scenes. This movie is a low budget masterpiece in the same vein as "Crawl or Die" which was done for $6,000.00. I am sure the budget for this film was higher but I liked both equally in that the endings were surprises. The cast was great, the acting was spot on. The character development was complete if you pay attention (some have criticized it). One reviewer noted that the actors were "obviously" meant to be cheap replacements for Christian Bale and Guy Pearce. I agree and throw in Amy Smart while you are at it. These actors did all three proud if that is what the intention was. The cinematography was done with low cost equipment but it was very well directed giving the audience the views it needed when needed. I, frankly, was amazed at the quality. One possible drawback to some is how the depressing the overall mood is at the beginning but that is integral to the story. Just so you know, I am a big fan of this type of film ... two of my past favorites are "Zardoz" and "The Quiet Earth" to give you an idea. If you liked those films you will enjoy this one.