I used it in a design. What I remember (it was a while ago) was the lack of OS and driver support from third party software houses. It was a mistake to use it.
That's a shame. I only used it at a hobby level and found the Linux kernel to be surprisingly stable on it (before Linux really ran on a lot of phones). This was just before Palm started going all-in on Linux/WebOS.
With time I think it could have been a real contender.