I've been longing for an e-ink Android device that runs Android 6.0 so I can use Accordance on a screen that doesn't hurt my eyes.
Well, my Likebook Mars finally showed up (a few weeks ago now) and I've put it through the wringer before deciding to make a recommendation. I have to say, I have read more of my Accordance resources in the past few weeks on my Mars than all my previous reading on Accordance. I used to just search and study. Now, I read Accordance deeply and immersively.
I love Accordance on the Mars. It's the perfect screen and the perfect size and the 8 core Android Architecture runs Accordance (and many other reading apps) beautifully. I've done a video review just for Accordance users. Have a look!