As a fan of Aselton, but especially her husband Mark Duplass (writer and producer here) I went in with the appropriaye amount of expectations. I didn't expect a full blown horror, and thus the lack of tension didn't disappoint me in the least. I still got a jump scare that made my heart skip about three beats....
Doesn't outstay its welcome (75 mins), has a great location made even greater with astute camerawork and the soundtrack is, as always when Duplass is involved, good.
The three leads (Aselton, Bell and Bosworth) are all very good, and that surprised me somewhat, never been a fan of Bosworth, but for me she's the best here.
After the shit hits the fan we get the weakest part of the film, but that is forgiven when they end it with a great final shot.