The FX in this film are quite good and the film is full of gruesome goodness. The concept, is quite interesting and while I think it needed a bit more fleshing out and backstory... I'm happy if someone tackles that in a sequel.
The film isn't all that unexpected once you get what's going on and short of the concept, isn't all that original... but what it does do, it does well.
I would easily recommend this film to those who I think would dig it. The nature of the film and the gorry aspects of it might turn the lesser minded viewers away ;)