I haven't seen much detail yet on the Nova, though it should be a serious contender. From what I understand, the Dasung is expensive - about $700. You could buy almost three of any of the others for one Dasung "not-ereader"! I haven't read anything about the Inkbook.
I have the Likebook Mars. Battery life with WiFi on is so-so. However, when I turn off WiFi and read an eBook for an hour, the battery percentage only drops 2-3% during that time. If that remains consistent, I'll be quite satisfied.
The only real issue I have with the Likebook Mars is the ghosting that happens in third party apps. The auto-refresh doesn't work with third-party apps. Boyue has promised an update this month to fox that issue.
Mine doesn't have Google Play yet, though units sold as of now apparently do. Some update should fix that as well. That's not a big deal for me. Google Play would probably hurt battery life if installed.
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