I too noticed that the stock fonts are not sharp. Typegenius can help in correcting this, but I found that the best solution was to add a custom font which I optimized for my default reading size and weight (essentially added 60 em of weight to Caecilia (started with medium base font) and scaled by 105%). This made a huge difference in font sharpness on my Aura.
As an aside I also had to do this with my KPW1. I am not sure why, but every e-reader I have had has required me to add my own modified font. For some reason, none of the e-reader companies seem to hire decent font developers to customize their fonts for how the devices render them in e-ink.
I too have noticed the diamond pattern. I think it is from the light diffuser layer. IMHO, It is noticeable in sunlight or bright indoor spotlights only when you go looking for it. I haven't seen it when the Aura light is turned on.
Overally, I still think the decreased contrast of the Aura outweighs the splotchy lighting of the KPW1 (and it's decreased customizability).
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