This was my first time reading a script-book. I did wonder how it would work as I was reading it to my daughter. To start with, she would read the name of the characters while I would read the dialogue. However, we soon found that we didn't need to do that, and most of the time. The story flowed well enough that we could work out who was speaking without needing to, most of the time.
The story itself was a great follow on from the books, I enjoyed finding out what happened to everyone. The alternate storylines when the boys used the timeturner were really interesting too, imagining a world where Harry was killed, and Voldermort reigned.
Although they did feel as though the author had pulled some fan fiction ideas to weave into the story. Not that this is a negative.
Overall, another great addition to the Harry Potter Saga.