hmmm ... some thoughts after viewing the videos:
1. Cool handwriting there ... no recognition engine I suppose? Slight lag visible.
2. Page flipping speed is quite slow isn't it? The actual blanking of the screen is acceptable, but there is a very noticeable delay between the flip-switch press and the blanking of around 1~2 seconds or more in some scenes. Is it just pdf files or is it the same for text files?
3. Keyboard entry ... keys do not provide any visual feedback that it is "pressed" ... or is there audio feedback that I missed out in the clip?
I'm mostly surprised by the lag between page flips. Its hardware specs is not shabby at all and I've seen slower machines perform better. Does eink really need such a long prep time before it can refresh its display?
