If you want a bunch of special effects, this is not the movie for you. If you want to be spoon fed a neat little story, this is not the movie for you.
If, on the other hand, you want a thriller or a movie that makes you think even after it's over, check this out.
A movie with one character can be difficult to pull off but this one is done so well. The acting was believable and you really felt his fear and frustration. There are some very tense and claustrophobic moments and they were filmed perfectly.
The makeup was also extremely well done and consistent. This is a miss on many movies in my opinion. Bad makeup "injuries" can really pull me out of the story but that was not an issue with this movie.
Put your stupid phone down and let yourself get lost in the tension of a great film.