Palm were crap, but they were all we had
I had a ton of them, starting with the III, and ending with the Tungsten T|X. I had over a dozen. I had several Zires and Tungstens and they died quite often and Palm sent me replacements.
First off, they had resistive touchscreens that required frequent calibration. I remember the surprise when I got my first smartphone and the capacitive screen never needed a calibration. You went through a process of "touch here. and here. and here."
Second off, the touchscreens had a mildly stretchy material, so if you did the same motions over and over again (such as playing solitaire) it destroyed the calibration. You ended up having to touch calibration points that it considered off screen, so the calibration process failed.
The black & white screens were awesome, as you could read them in the brightest sunlight. In fact, the brighter the light, the better the contrast.
The color screens were SHIT. They washed out in anything brighter than candlelight and made it useless outside or in a bright grocery store.
I did write a bunch of apps however, including a financial app that I ported to Android along with the data, meaning I have electronic checkbook records going back unbroken to 1993. That's nice.
I consider my Android phone my always-connected PDA, as I sure as hell don't make or answer calls on it.