As someone who switched to KOReader on my (now my wife's) Libra H2O a while ago, I love it. I have completed 206 books so far this year, and at most 6 of them have been in the stock Kobo reader. the rest in KOReader. I especially love the fact that its stats work - in the 4 years I've had a Kobo, the stock reader's reading time stats have never once been remotely useful or sensible.
Some people fix all their epubs before reading but for me, that's way too much faffing around, so KOReader's override options are easier. Especially because they involve zero typing, something I avoid as much as possible.
Of course, the best thing about KOReader is that it's free easy to install AND easy to uninstall, so you lose nothing by giving it a try. If you like what it offers, great. If not, also great.
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