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I hesitate to get into any spoilers so early into Cabin's (hopefully long lasting) run but suffice it to say, this movie is well worth any horror fan's time. My advice would be to avoid any further articles or reviews and just go see it with as little advance knowledge as possible. I almost wish that the marketing hadn't given away the fact that there's an outside group at work in the film but as it's something that's revealed as soon as the movie begins it's hard to call it a spoiler. There's no real twists per se to be revealed but there is a sense of surprise as the story escalates that should be preserved.
On the downside, the scare factor isn't very high at all (some might even call it non-existent), which is a slight disappointment, but by the climax I'm betting that most fans will feel there's been ample compensation for the lack of full-on terror. I know I left satisfied, at least. In interviews, Whedon described Cabin in grand terms of being "the horror film to end all horror films" and while no such beast will ever exist, Whedon and Goddard clearly had a ball trying to create it. If only every filmmaker working in the genre could show as much love and enthusiasm for it.