Their big claim, at least it seems on quick glance, is in the controller, not the display. You can use any e-ink display with it. The display with glare that you're complaining about I think is just the cheap display they're including in the dev kit.

Oh really? I completely missed that. I thought what they were offering was an e-ink display with a latency that's low enough to use as computer screen.

It's possible I just can't read.