Seems almost exactly what I was asking to a e-book reader: fast refresh, powerful enough and potentially open to run user apps and allow offline work; price is nice too. My only complaints are the use of Android, no 13" version that would be a godsend for technical books with graphs and diagrams, and the apparent lack of a headphones connector. Not sure about the latter as the web page is absolutely atrocious to navigate if one is after actual information instead of fancy graphics.
I plan to continue to to wait for the PineNote to mature, because I will always sacrifice functionality to get more openness, but I'm glad something is happening also among the others. Its screen refresh speed is fantastic; I hope they will license the technology to others too, and possibly make panels alone available for sale. As a maker, I would welcome even a reduced speed (say 5-10 fps) version of the raw panel for sale at a decent cost for tinkering.