Harry Potter finished

I just finished the last Harry Potter book (Deathly Hallows). I must say that it was very entertaining, enjoyable and a little surprising as well.

I thought the book was quite complicated since all the plots of the former books came together in this book. Because I do not have such a good memory that I would memorize everything that had happened until now, the story line wasn't always easy to follow.
So one advice for those who haven't read the book yet, but intent to do so: browse through the other six books before you start with the seventh.