For those who are interested how Onyx did with the E43:
I
posted something over in the german subforum back then, including the unboxing and trying out some software.
All in all it was a try, and a nice little pocket-E-Reader, but not really usable as a mobile (and they screwed up terribly by using faked IMEI).
But I still use it as an E-Reader sometimes.
(IMHO Yotaphone took the best turn in this matter. I don't own one but from what I read the double-display-approach works far better than something with just an E-Ink display.)