I just watched "Arrival"
Having read the Chiang story a few years ago, and already considering it to be one of the finest things that I have ever read in my (long) life, I was bowled over by the quality of the movie.
It was handled meticulously well and far above average for a "Hollywood production", and the end brought tears to my eyes.
However, I feel sorry for people who see the movie without having read the story first, it must be perplexing and frustrating.