I actually built one myself, but used raspberry pi so it needs usb cable for power. It works well but contrast on the display is not that good for photos. Would work well for text or like smart home panel.
For me, I found that the display I'm using works reasonably well for photos, but you need to slightly boost the contrast of the image before updating the display, to compensate for the darkness of the display. If you're using PIL in python, this is just something like "image = PIL.ImageEnhance.Contrast(image).enhance(1.3)"
I do that immediately before dithering into 16-greys, and get entirely acceptable photo displays that way.