The PW3 has a better looking screen then the PW4. The PW4 looks muddy. The PW5 has a better screen then the PW4.
You don't need to a 300DPI screen to be good. My Kobo Aura H2O has a 265DPI screen and it's better then the PW4.
I've not seen the Scribe in person, but I would expect the screen to be better then the PW4. It's not hard at all to be better.
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