Based on a previous review here suggesting that fans of The Ring would like this I went to see Shelter and I think the previous advice needs more clarification. If you liked The Ring then yes, you'll probably like this. If however you thought The Ring had pointless cut aways and sudden close-ups just to try to build tension or make you jump, then you will be as equally frustrated with this film. Still in the latter group, I would assume that you loved Ringu and therefore you will appreciate the story this film is trying to tell despite the occasional ham-fisted way it goes about presenting it.
Jonathan (male lead) is really quite good, although Julianne comes across far too much as if she has been cast as Dana Scully. In truth this whole film would have been more believable if this had of been the story line for the X Files 2 movie. Knowing that going in will probably help get past the weird opening 30 minutes where it swings from place to place until we settle on the story it is wanting to tell. Despite the plot holes and some questionable decisions by the characters, I did leave the film feeling pleased and positive about the whole experience.