From the video, it looks to me like they're pressing the stylus fairly hard on the tablet, I wonder what's up with that.
Also, I wish they were able to use an e-paper with a faster refresh rate, like ClearInk claims to be (see e.g. https://youtu.be/kE_byDwLjxk?t=34).
That said, it seems to look quite attractive as is already.