very impressed with this, just finished watching it, a subtle idea of re-imagining a tired and tested formula utilising basic equipment and naturalistic treatment throughout. it is exquisitely realised from beginning to end.The acting is very believable and sucks you in as the couple seem like people everyone knows. i was not aware of the hype surrounding the film & all the marketing “buzz” so did not know what to expect. Am a big fan of the J-horror explosion in the early years of the decade, how eerie natural(or in this case supernatural) sounds can be and i liked how this film made its effect on the viewer, the tension builds and i think the single shot capturing of the bedroom at night crucially works, it really is riveting viewing, you don’t know where to focus your attention-either on the couple in bed or the door..anything can happen, i like how you really don’t see much as such but concentrate more on the reaction of the couple,its amazing to think that anyone could have made this film in their home,its pretty inspiring and impressive, maybe that’s why there are so many bregrudgers,there are some very freaky moments that do make your eyes open wide, and the ending is brilliant no matter what anyone says.lots of people here are comparing this to the blair witch,a movie i haven’t seen but i think its unfair and you should take this film on its own merits. however the movie it most reminded me of was Cache by Haneke and it really trumps that, i have been very disappointed with American movie-making over the last few years but this blew me over,a breath of fresh-air..is there more than one version? i saw the 1hr 37min version,am not sure what version many of the other posters have seen,am sure this will have its detractors and will spawn many parodies but am very glad i saw this and am looking forward to seeing it again