Just watched this today at the cinema and thought it was excellent. The characters were all engaging and well portrayed and rather than rely on jump scares or gore it taps into the more disturbing side of the psyche, delivering a sense of dread throughout. It deals with grief and loss and makes good use of this in terms of the desire to contact the dead and the risks associated should you meet something you're not expecting. It doesn't try to be too clever with twists and turns, just good old fashioned story telling with a very dark side. You can kind of work out the ending about half way through based on some of the script but it didn't take away from the experience. Highly recommended.