I think this kind of device is also useful for art/literature students, and writers of all kind that does alot of writing. Sure you are likely to type, but I took some art/literature courses which does a lot essay writing, one of the prof. suggested that after we finish our writing, it is better to print it out and do the editing on a real page before finalize it into the computer. I found that true. So I think this kind of device can also be marketed to writers of all kinds for editing purposes.
Also, for note taking, as many has point out already, the math symbols/charts/chinese characters/eye friendlyness... there are other advantages. Many laptops now days still lasts 3-4 hours on a full charge (however, the new macbook air/pro are exceptions). That is not a comfortable battery life for students to bring to full day classes and use it to take notes. And they took much longer time to do full charge (including macs, I assume) than e ink devices. And even macs should cost more than this notepad (I assume).
An advantage this device for company on productivity than traditional tablets/computers, is that it is less distractive. Employees will less likely to use this device and wasting their time on games/interesting apps/web surfing etc.
That is all I can think for now.
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