I used to use Psions - the first one was an XP I think (calculator-style, 2-line by 16-character display, 32k RAM!) in the late 80s. I then graduated to an LZ64 (4-line by 24 character, 64k RAM) and used the XP to do things like control a large map display full of LEDs.
Then it was a 3a, which had at least one new display cable and was then pronounced a writeoff because of a corroding PCB. Then a 5, which is ever so clever but really a bit too fragile, and has a very poor display.
And then two Palm Vxs (lost the first when I was mugged).
And now a C860, with pdaXrom. Hmmm!