Significant Other is a sci-fi mystery thriller with a very small cast. It's basically just Maika Monroe and Jake Lacy that have all the screen time but they did a good job playing their characters. As for the story it's easy to follow, it has a good eerie vibe to it mostly due to the good soundtrack and mysterious plot. The sci-fi scenes were innovative and interesting. As for the mystery there's a good twist, not a lot of people will see it coming. In this genre there are a lot of stinkers, but also a lot of excellent movies. I would rate this one between them, certainly good enough for people that like this genre and maybe lesser to people that prefer realistic stories.