This adaptation of the half-blood prince while entertaining fails to remain very true to the books. Much of the story is missed or dumbed down and towards the end there's a dissapointing lack of a number of pivotal and exciting scenes. Dispite this I found the acting, scenery and effects in this movie to be far better than the previous ones and the movie is far more watchable and entertaining. As for the arangment on Blu-ray I was very impressed. This is the first Blu-ray that I have bought and I was impressed to see that not only is there the movie disc and a special feature disc but also a DVD copy and a digital copy for use with media players such as itunes. All in all this is a very worth while purchase despite the less than perfect adaptation. I'll be looking farward to the next instalment.