Ok, I installed it (it just sideloads like Koreader, so it doesn't 'overwrite' anything) to try it out. It worked fine overall, but: 1) It took a lot longer to

Ok, I installed it (it just sideloads like Koreader, so it doesn't 'overwrite' anything) to try it out. It worked fine overall, but: 1) It took a lot longer to load than Koreader (so much so that I thought the reader had frozen) 2) I couldn't figure out how to have it trim PDF whitespace as tightly as Koreader does, which is important for being able to reasonably read pdf files. 3) I added additional fonts into its font directory (and I noticed that some other fonts were already there), but for epubs I couldn't figure out how to change the font from Libertinus Serif. 4) It's not clear that it has all of the advanced font features regarding kerning & ligatures that Koreader has added. (I'm not sure what's enabled by default in terms of kerning/ligatures since I couldn't change to a font that I'm more familiar with.) 5) It generally seems to have fewer features than Koreader. But: 6) Visually, the interface is cleaner-looking than Koreader's. And it's a simpler (and perhaps easier/more intuitive) interface than Koreader's. So perhaps I'd recommend it for someone who wanted something more basic/easier, but at this point I'll stick with Koreader.