I've compared it and there were improvements but also a major flaw against PW3 2015.
Advantages:
- Very even backlighting
- Visibly faster refresh when browsing
- 16g lighter / 182 by catalog, on my scale = 184g)
- more memory and water resistance (no matter to me)
Disadvantage:
- the text is transparent (
lower optical density/solidity than "2015, even with different fonts ...).
I tried with two bold fonts (helvetica and amazon ember bold), it's a bit better, but I read with serifs (e.g. bookerly) ... and there is no bolding option like Kobo. That is a pity.
I tried to upgrade but there was no improvement.
Is it this?!
P.S. It has a luminescent background (cold white)
Here is the current version of the reader:
5 10 0 2
So, may be I tried newest 8" reader... (Onyx)