I bought this set because I'm a bit of a Harry Potter fan (the films anyway) and the price was 'an offer I couldn't refuse'.
The transfer on all six films is good, and well worth the investment. Buying Bluray is always a bit of a lottery as the hype would lead you to believe that the picture will be stunning. This is far from always the case and that rule applies here. The picture is better than DVD but only marginally - the original being pretty good to start with - but the improvement IS worth having. At the price I paid, around £18, it's a bit of a no-brainer.