Thanks for the replies, everyone.
Originally Posted by Blossom
I think the truth is eInk varies. I have a good K3 but my brother in law's contrast isn't on his as good as mine. I have two K4s. My first one has horrible contrast and my newest one is the best I've seen on a eInk reader. The PW isn't as bad as my first K4 in background shading but it's close in lightness of text. I'd say without the light I wouldn't be happy with using it.
I can say the PW has become my sole reader. I don't even need to switch around anymore. Even with my K4B's amazing contrast it still can't compete with the PW.
The PW has become my sole reader too. I love having one reader and not having to sync anymore. The contrast on my touch is definitely better than on my PW though and the text on my touch is darker as well. However, my PW fonts now look much nicer with the custom fonts I'm currently using so I'm happy about that.