i will make this brief . this be a decent movie . be it completely groundbreaking . no . will you enjoy it . i do . there be ton of people on here talk about how it doesn not make sense and theorize about the end . compare it to butterfly effect or the jacket or . yadda yadda . if you have half a brain in your head and you will at least think this movie be worth watch . the end be not hard to figure out . there really arent any massive plot hole . it just a good psychological thriller . with a hint of sci fi or horror . the acting be 85 % good . this movie will not change your life . but . if you be like me and you have see almost everything else the world of cinema have to offer . this movie really isn not as bad a a lot of what be out there . oh . p. s. the fact that every time a movie like this come out . people compare it to the butterfly effect . make me want to vomit . butterfly effect equal 2 star . the i inside equal 7 star .