So I too received finally the PW2 today. My first impression feelings are little bit mixed. I don't see any other change regarding actual novel reading than the display/lights. And that change is a two-folded one. On the other hand light really is more even now, but the other side is that now colour is little bit yellowish. I also noticed that the letters are less fragmented now than they used to be (thus more contrast), but I guess that is the reason why ghost letters show better too. Had to enable the refresh on every page turn option. The increased contrast is very hard to notice unless you really start looking it and maybe even use some tool to zoom in, so maybe not worth it.
Anyway, have to test it in actual reading situation, so cannot doom it completely yet. I have a feeling that yellow colour is going to be a problem on long reading sessions.
I'll add the close-up pictures I took with my Note3 in order to demonstrate the letter ink fragmentation. I had to use flash in order to focus, so colours tell nothing on these. Try to guess which picture is for which device?