My use is exclusively reading epubs converted with calibre. I've ordered an H2O, and will be selling an 8" Onyx Boox.
Why? The SW is not nearly as well-developed as Kobo's, and the backlighting is 2011 all over again (it's uneven and the LEDs at the bottom of the screen are much brighter than the rest of the screen).
Among the SW aspects I prefer on the Kobo vs. the I86ML+, it has a real English dictionary, crashes less often, and you have great control over font and size. On the Onyx side, it's real Android, so you can run other applications a lot more easily, but it starts to feel like an eReader kit to me.
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