Good concept but bad executing.. I think the movie is so-so. It has good idea about the time travel and alternate realities but the plot is really forcing and easy to guess. Perhaps, worse still, the love interest here (as played by Liv Tyler double Michelle Monaghan) is utterly underdeveloped. Why are we supposed to be invested in their relationship? They hardly know each other. Upon the first of their repeated meet-cutes, he calls her a simulated distraction, and, indeed, she's never quite developed beyond that. Gyllenhaal and Farminga's characters establish a far more meaningful bond. At least, it looks cool.