The Pomera line of devices from the Japanese company "King Jim" (yeah, I don't know) are really nice from a features point of view: limited enough to stay out of your way when you're writing, functional enough to enable the basic workflows you'd expect e.g. basic file management, SD card/USB transfers (something that many/most/all Western boutique writing devices like the Freewrite somehow didn't support well or at all last time I checked). Somewhere I have a funky e-ink Pomera thing with a folding keyboard that I did a lot of writing on, and later I bought a DM250, which is not e-ink but works pretty much the same, and now has a US version. I recommend it.
The US version (the DM250US) is now $549, alas. I was looking at these briefly, but can’t justify the expense — might as well get a MacBook Neo if I were in the market.
Yeah I think that's substantially more than I paid for my JP market version.
I will say it is a really nice device, probably the all-around best of the dedicated writing devices I've owned and/or researched over the years. But on a typical value scale, it's not worth that.