An update...
Today I returned my Aura
The reason I decided to return it wasn't because of the pinpricks, or that it was yellow at the top and white at the bottom (like cr3nk), or because the dark was grey - but because it barfed on my Japanese e-books. I will be living in Japan from next month and I may as well buy one there after the firmware works with Japanese books and hopefully the issues with the screen have been sorted. As a bonus, it will probably be half price too! The Kobo Glo is currently 8000 yen in Japan which is about 55 GBP, nearly half of the UK price.