I was able to read a couple of hours on my replacement PW this evening without any eyestrain, so I'm pleased! It is in no way as good as the Amazon marketing ads make it out to be, but it is a lot better than using a clip on light, and better than any other eInk reader I've ever used. But Amazon still needs to work on font rendering to make it darker and heavier. Whenever the light level is turned up high enough to render a really white background, the text starts to look light and thin.