I'm testing now for a while the Gemini-PDA.
The most problem I think is the software: Android isn't designed to be
operated by a keyboard and to produce a lot of data; to be creative. It
was designed to present datas to the user, of course. So I have problems
to use the Usenet or to make my homepage. Both is possible on the Gemini
but there are still many issues to do the job with the software on the
Gemini under Android.
And this is the different to the Psions I find: The Psion came with a
operating system which was specially designed for it and also to produce
Der Geist ist die Freiheit. (Frei.Wild)