Usually independent movies tend to be slow and boring. But this just grabs you from the start, it's so intense and sometimes difficult to watch. There's not a moment where you think it drags. It's like a ride that builds and builds, and the ending is explosive. I won't spoil it.
@Yoyo - it's not a horror film and it's not meant to please horror fans. Though it certainly has gory moments and a few big jump scares, that's not what the movie's about.