Ishiguro's novel, I couldn't easily leave the world he created and felt that I had to see the movie version right away.
Last night I watched the adaptation Never Let Me Go. It is nowhere near as brilliant as the book, and the secrets are revealed much sooner and more bluntly. You are far less immersed in the tense minutia of life at Hailsham.
In spite of all this, the movie is effective. It was powerful for me to see things that I had not had a visual of, and the extreme, painful, and tragic vulnerability of the grown characters was conveyed in a much more direct way than in the novel.