Well, thanks! These are good contributions.
While I still think stand in good stead re: semantics, as I think I made pretty clear the type of ereader I was referring to in my OP, nonetheless, I have to admit that I never adopted the nomenclature of Digital Note Paper.
Because 1) it felt like artificial market segmentation - they're e-reader tech with an improved ability to write (that's still my opinion); and 2) to be frank I thought the idea of using one to replace all your notepads was a bit of a gimmick (which is not to say it doesn't have its validity).
I was using an Onyx Boox M96 until it recently broke, for proofing and general reading.
@Quoth there's a new e-ink/typewriter called the Freewrite. Perhaps that's what you refer to. It looks to me unergonomic and terrible, with a tiny screen that basically sits flat on the desk. Nonetheless some people *seem* to be making good use of it.
My scepticism about these devices in general, and one of the reasons I came here to ask is that I worry that people buy them, rave about how great they are in their Amazon review and then a month later discover they're impractical and move onto the next new gadget.
By the way @Hitch, I not only write by hand, I also use Dragon Naturally for dictating my writing to the PC :P. For a variety of reasons this works best for me.
@gmw I can only imagine the hole I'd have dug if I'd mentioned "portable writing tools" as the topic. One can easily swing from too narrow to too broad

.