I really enjoyed this film. As with the majority of instances of its ilk, I found the handheld movement of the camera jarring initially but, in this case, as the film wore on, the small readjustments [were there single frames removed even?] became more and more justified.
Kristen Stewart, with her typical "I'd rather be anywhere but here" gait, is perfectly cast as a grieving medium, and goes to places I have not seen of her in the past. There were a couple of moments of teeth-on-edge tension, and an absence of jump scares -- more a refreshing toying with the conventions of audience anticipation.
Okay, the ending was somewhat clichéd, but I think knowingly so, given there is something faintly ridiculous about the whole film...but isn't that what films are for?
A guilty pleasure.