It's very effective at maintaining a high level of tension over a long stretch of time, but the suspense is relentless to the point of exhaustion. That isn't necessarily a criticism, especially considering the premise, but I think this aspect alone might limit the movie's appeal.The characters were difficult to sympathize with, except perhaps one. Some minor characters felt like stock characters that were added for the sole purpose of being dislikeable.Overall, I found it worth watching.

This movie is intense and is definitely a thrill ride. I would recommend this movie

Some of the so-called plot twist were predictable.

I liked it, lots of suspense...Had a great time at screening