My new phone arrived at the weekend, and is now installed in its bumper case (which is rather shiny, so I'm on the lookout for something with a matt finish) and with a screen protector (although I'm still waiting for the thicker, glass, screen protector to arrive.)
Now I just need to find time to customise it and check it out properly. I expect my Voyage to stay at my bedside again shortly.
My next thing to do is to try out
kacir's hint from the other thread:
"You do not have to use the build-in app for reading the books, you can also use your favorite Android app and switch on display mirroring. But when you do that, you should modify a config file telling Yotaphone to switch on 16shades graphics instead of default B/W for mirroring mode for that particular app.
16 shade mode has refresh frequency 2Hz and B/W has 8Hz
See http://forum.xda-developers.com/yotaphone-one/general/how-to-read-manga-e-ink-display-16-gray-t3474189"