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The only screen issue that I'm aware of is a greenish hue from a poorly calibrated LED, noticeable in varying degrees. In my case, the green is not very intense or wide, and only appears in one LED when the intensity is at 85% or above. I was initially disappointed with that, but quickly found that I preferred to manually control the lighting anyway, which means that I could avoid the issue entirely. That being said, I don't really think it's acceptable as a matter of principle, because of the price that the device commands. Some folks from the forums were able to return and replace their devices until they received a model with no issues, but many kept receiving devices with the green light as replacements. Basically, I'd say you have a 50:50 chance. I don't believe Kobo fixed it, since there was no real outcry, and they sold like hotcakes regardless. Of course, one could always claim that it was one faulty batch, but who knows.
I can't comment on DPI density in E-Ink readers, as the Aura One is my first such device. What I can say is that I can notice the resolution difference depending on how close I tend to be to the screen. I have good eyesight, and prefer having smaller and denser letters to better simulate a printed page, which means that I tend to read my Kobo as I would a book - relatively close to my face, at about a 20-30cm distance. At that distance, compared with my other (non e-ink) devices, the DPI difference is noticeable, and the letters are crisper the higher the DPI. However, it really doesn't go beyond that feeling of crispness, so if you tend to read at a greater distance, don't care for it, have poorer eyesight, or even if you tend to read fast, then I'd say either should be acceptable.
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