I also own some of these palmtops, 100LX & 200LX, plus a few later models running WinCE. Definitely a quality HP calculator style keypad with good tactile feedback, but only usable for hunt & peck or two thumb style typing. Still way better than the mushy calculator keypads on the Sharp/Casio/TRS-80 Pocket Computers of the 80's.
I used the 200LX for various things like configuring routers, reading newsgroups, and writing emails, even a little programming, but certainly if I was writing an article my TRS-80 Model 100 or Dulmont Magnum (Kookaburra) were way better options.