Everyone seems to be having different experiences but compared the my Touch, the PW has darker text and roughly the same background. Resolution is very obviously better, hi h is something that always bothered me on previous models.
As far the light source being evident, this really shouldn't surprise anyone. Have you ever used a clip on book light? This is much better than that. If you want a seamless lighting experience you'll have to go with a backlit LCD reader, that's all there is to it.