They’re shockingly useful today as a tool to manage ADHD, since they have a buncha organizational software baked into the OS, with plenty of other productivity apps still available for download off of PalmDB, without the connectivity nor distractions of a modern smartphone. I’m using a Sony PEG-UX50, which uses PalmOS 5, has a built in keyboard, and expandable memory (in the form of Sony Memory Sticks, cause Sony was addicted to format wars at the time.)
It’s smaller than I was expecting, but in fairness modern smartphones are gigantic. It’s perfectly sized for comfortable usage of the keyboard, and is genuinely worth grabbing one if the interest and budget are there for it.