Easy mental comparison: 6" screen == mass market paperback page, 8" screen == trade paperback or small hardcover book. If you want to read full page-sized PDFs (like academic journals or papers), you'll need something bigger than that.
I'm very happy with my Inkpad 3 (7.8" screen). I had a 6" Kindle for years before that and I sometimes still read on my older device, but the Inkpad screen is far superior. I do use the frontlight and a battery charge lasts for weeks on it.
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