I had a Sony Clio prior to this, but Sony stopped making PDAs. I loved the Sony, but was afraid it would die eventually after four years and I would lose all my stored data. So I tried the Palm Z22 for its low price tag and ease of use.
Good things: small, light, less clunky that the Sony; great price for the functionality; easy to learn; the new graffiti is more like regular writing
Less than good things: You have to tap the screen pretty vigorously to get it to register, and the letter "l" on mine just doesn't work, so I have to switch to the keyboard. And the cae options aren't great. Also, the screen is smaller than the Sony, so you can't see enough on one screen to be able to check a phone number, for example, without going into the full entry.