Long review, but thanks!
Surprised about the batterylife of the 700 despite using light!
Perhaps take another shot of the last picture?it's a bit blurry.
Sony could try to achieve a newer model by making a semi-transparent -matte plastic background, that will allow ledlight from the back to pass through.
When having a layer of hard,tough, transparent plastic on the top, the e-ink layer, and a semi transparent matte white background, then a layer of fiberoptic and white or blue leds, and then a silverish foil that reflects the light to the screen, Sony might be able to get a backlit 505!
Plus, it's healthier for the eyes too! (in direct sunlight, the white will seem slightly less white than the standard background)