I spent quite a long period with an Aura HD recently (setting up and training a relative) and I found the fonts crisp, black and very gorgeous. The font weight adjustment feature is something I now wonder how I ever lived without. (And yes it works on sideloaded books.) If you are just looking at an unmodified Avenir Next font or something, it is going to appear "grey" because of the thinness of that particular font. But you don't have to use that font, and if you do, you can adjust its weight to suit.
I know next to nothing about footnote management, sorry (I mostly read novels on my Kobo; complex nonfiction with images and such goes onto the iPad Mini).
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