[Quoth]

The Nxtpaper 2.0 and 3.0 models are fine for reading. The mono eink is only better under ambient light with frontlight off. The default settings are not the best. sRGB, adjust colour balance and only have auto brightness outdoors. Turn down brightness a lot indoors. Far superior to color eink for relaxed reading and no eyestrain.

The eink simulations (mono and color) do make Nxtpaper 2.0 or 3.0 look more like eink with a front light on. They are inferior to simply properly adjusting sRGB mode colour balance and screen brightness. A marketing gimick.

My Nxtpaper 11 (not pro) has comparable battery life to some eink and the Nxtpaper 40 4G phone and Nxtpaper 14 are pretty good. Note that the 14 is 14.25″ and 3:2 aspect, so practically twice the area of a 10.3" eink. First portable device I've ever had that's good for all PDFs. I ditched the reMarkable and Elipsa (both 10.3″ eink).

I read novels on the 8″ Kobo Sage without front light due to handy size for me. I have also 5, 6, 6.8, 7 and 7.8 eink. It's a pity there isn't an 8″ 4:3 Nxtpaper, but really reflowable novels don't need colour and 14.25″ is far a better size for coloured books with photos, graphic novels and comics.

I find the Nxtpaper 11 (10.9″ 16: 10 aspect) best for notes due to being much smaller & lighter than the Nxtpaper 14 (The pro version of it is for gaming) and the Nxtpaper 14 is a much better size than the Nxtpaper 11 pro for PDFs.

Edit:
The Nxtpaper 2.0 & 3.0 LCD and OLED models look totally like a new display technology. They make the iPad look like garbage. They do not look like regular LCD or OLED models. I've not seen the recent Lenovo and Huawei models that are supposed to have matt paper-like displays. Finally Apple has non-shiny screen, it's $1000 extra!

Shiny is cheap and the reflections give headaches. One of the eink ereader features that puts up the cost is the matt surface and it's got nothing to do with eink.