Pottermore has updated now to allow the first million users from the Magical Quill challenge to give a thorough, detailed response on their experience of J.K. Rowling's interactive
Harry Potter site, as well as answer a rather long survey asking about issues, bugs, and the best and worst aspects of the site.
The survey can be found
here.
Feel free to comment on your Pottermore experience in the comments. The site is tentatively scheduled for a public open later this month.