* I use it daily, but really only for my shell, including vim for coding/writing configs. Depends on the day, sometimes I spent more time in the shell than in the browser, sometimes it's mostly browser (and thus plain old screen, not E-Ink).
* I think that's hard to say since my main screen is so much larger. I did notice a difference in the evening between a tablet with Youtube vs a Kindle with a newspaper or a book. Although I do remember one or two evenings where I turned off the main screen and only used the E-Ink screen - I think there it helps with going to sleep later due to less blue light.
* I haven't noticed any degradation so far.
* I like it. I've barely had problems with eye strain anymore and eye strain was the main motivation for getting it. It's also just a bit larger than my laptop, so it's great when I travel somewhere where I'll use my laptop a lot since I'll get a second screen on the go/for the hotel room/etc.
Huh, weird. I got the small Dasung with a backlight, but I almost never use the backlight since avoiding that is one of the reasons I did get an E-Ink screen in the first place. You do need the room to be somewhat well lit, so in the mornings and evenings I'll turn on the overhead lights. Probably slightly harder to read than a book since the background isn't bleached white, but it's close-ish.
Looks pretty nice, especially the USB-C input. I might have gotten that one if it had been available when I was shopping for an e-Ink screen.
I got a Dasung 13" one a while ago, the larger Dasung wasn't launched yet (and I was struggling a bit to justify the price tag of the 13", now I'd probably go for the larger one). It's very limited, basically only works for black and white text, but for that it's great. I use it pretty much daily, just keeping a shell open there. I've changed my terminal to be black on white and all colors map to light/dark gray (for light/dark versions of the basic terminal colors), which works decently. I did change themes for things like tmux and vim to work better on a grayscale screen.
Reading text on it is great, but compared to a Kindle Oasis (whatever the newest model was last summer) its DPI is quite low, so you can't have text as small without it getting blurry. I mostly got it because I noticed that I was getting some eye strain staring at a regular screen all day and as best as I can tell it really has helped with that. It's also powered off of USB, which makes it usable on the go as a second screen.
My main gripe is using a Mini-HDMI-Port with a custom cable to inject power from USB (I think HDMI->Mini-HDMI plus a separate USB cable for Micro-USB input also work, never tried), but it's also a bit annoying that the inputs are on the sides and not the back. I also use it with a monitor arm at home, the included pole for standing it up is ok for on the go, but I really wouldn't use it permanently.
TL;DR: expensive, but if you want to reduce eye strain while reading a lot of text it really helps. Main driver for shell / coding tasks and I sometimes read longer websites/Google Docs/etc on it, though less frequently.
* I use it daily, but really only for my shell, including vim for coding/writing configs. Depends on the day, sometimes I spent more time in the shell than in the browser, sometimes it's mostly browser (and thus plain old screen, not E-Ink).
* I think that's hard to say since my main screen is so much larger. I did notice a difference in the evening between a tablet with Youtube vs a Kindle with a newspaper or a book. Although I do remember one or two evenings where I turned off the main screen and only used the E-Ink screen - I think there it helps with going to sleep later due to less blue light.
* I haven't noticed any degradation so far.
* I like it. I've barely had problems with eye strain anymore and eye strain was the main motivation for getting it. It's also just a bit larger than my laptop, so it's great when I travel somewhere where I'll use my laptop a lot since I'll get a second screen on the go/for the hotel room/etc.