Storyteller can sync your progress between devices, although there’s occasionally a bit of a bug with it (will be fixed soon). I sync between my iPhone and boox.
Once you get all the e-ink settings dialed in to make black text more readable on the color e-ink screen, it’s pretty damned good. I never notice ghosting. It’s not very easy to get the settings dialed in though. If you are purely reading on it get a black and white screen if it’s in stock so you aren’t fiddling with it to get text to really be boldly black instead of grey.
Once you get all the e-ink settings dialed in to make black text more readable on the color e-ink screen, it’s pretty damned good. I never notice ghosting. It’s not very easy to get the settings dialed in though. If you are purely reading on it get a black and white screen if it’s in stock so you aren’t fiddling with it to get text to really be boldly black instead of grey.