Loved it! But have one question... (possible spoiler)
I absolutely devoured this movie, twice in three days! It took two viewings (the first was just to see the effects, the second was to get into the plot) to get my mind around the whole subtle storyline.
Now I have only one question left. What the crap was that thing emerging from the tied-up slave woman in the basement? Was that how the family and other victims became the demon creatures? If so, why didn't that happen to the main cast as they each became "changed"? Or was it simply her insides being churned out by the sacrificial process?