Afilm can NEVER reproduce the book, that's probably just clear. Nevertheless, the film is a fantastic adaptation and adheres perfectly to the book. Due to stress and film dynamics are naturally (in my opinion :) little things changed, added done or omitted. Does the movie in my opinion, absolutely no damage.
I like the first two parts also very very happy, but Eclipse is the best so far. I look forward to two more film of Breaking Dawn and just hope that the author himself but by still struggling to bring "Midnight Sun" at the end and release it.