The combination of poor contrast and poor viewing angle results in color inconsistency. (tabletpcreview.com)
And as on other e-readers and televisions, the display can be harder to read, and you'll have a perception of less pop and poorer contrast compared with a black bezel. (pcworld.com)
While this approach works well with backlit LCD screens, with reflective eInk it produced a display with very poor contrast ratio (see comparison with Kindle 3 and 2). (ereadertech.com)