These units in the above pictures were the ancestors of modern netbooks. I've tried them all, time after time ins in exhibition events and fairs, all terrible about the keyboard to the point where you really wouldn't want to type anything on them for more than 40 minutes!
I installed a vt100 emulation program on a Toshiba Libretto 486 running DOS, it was fast enough for the task running a serial connection (agetty /dev/ttyS0,119200bps on the other server machine), but the keyboard was so terrible that you would only like to use the unit as "monitor", e.g. "htop", "netmon", or similars.
All, except the Psion5, on which I found comfortable enough with the keyboard to type some articles, but meh ... using vt100 as a terminal for a server is something I haven't been able to do for more than 80 minutes, and not because of the screen, but - again - because of the keyboard.
So, the problem is always the keyboard! I've tried many of them, and I have to say: of the ultra portables, I didn't feel comfortable with any of them! and with the modern 8" ones that sell on Alixepress (someone reviewed on Youtube), things are even worse, because those keyboards, on the one hand, have a better aesthetic appearance (copied from the Apple Magic Keyboard, resized to fit a smaller shell), on the other they are much more annoying to use.