Finally got around to seeing this wonderful movie the other day. The acting by the leading men is stunning and very realistic; the movie draws you in at the start of the movie, and keeps you captivated through the whole movie. I found the plot and entire storyline to be really interesting. At times it seems a little underdeveloped and rushed, in particular the ending rooftop sequence was rushed; I felt like laughing as the characters were leaving the elevator and everyone was dieing.
Overall, it is a good movie and I recommend you watch it when you get a chance.