[GERGE]

Kobo's own typeface Kobo Nickel and its default typeface Georgia are quite bad. I am not speaking of taste here, they are factually bad for their purposes.

Kobo Nickel is a mess, it is not even a text type. I would only use it for small amounts of text, most likely to get more attention from the reader. For ads, for text boxes, for names under quotations... But for long texts; nope, not happening.

That Georgia is bad is sad actually. Georgia is an awesome typeface but the Georgia Kobo uses doesn't have kerning pairs and ligatures, but the thing is, it should have had them, Georgia I have is a nicely kerned typeface with ligatures. They probably didn't want to pay for a proper version.

And their other typefaces are badly configured for the kepub engine. While all of them except Georgia have kerning and ligatures, we see them only on epubs. Kepub renderer doesn't support ligatures, but with a simple change to font files, kepub renderer render kernings. I know that they cannot make changes to kepub renderer as it doesn't belong to them, but I honestly don't understand why they don't do that small change to the fonts. In my professional opinion, licensing shouldn't be a problem for what is needed.

Kobo's epub engine RMSDK is very good typographically, and Kobo's TypeGenius and typesetting settings work very well. And apart from Georgia and Kobo Nickel, they all render perfectly good. Try testing epub files with Amasis, Malabar and Gill Sans. These are the best ones.