There's nothing wrong with the T5: it's a really nice unit and bluetooth works with no tweaking all the time. Bluetooth is a tad buggy on the 3100, but I finally figured out how to make it run when it does'nt want to.
The main attraction of using another Zaurus is:
-the keyboard: I rarely reply to email on my T5 unless I pull out the IR keyboard as using graffiti is too painfull for anything more than a short sentence.
-PDFs: pdfs are becoming, at an accellerated pace, the no. 1 means of document exchange. I noticed a major adoption by everyone in the last year, more so than any other year. One cannot view pdfs on any Palm unless you do a desktop conversion first. Dataviz is coming out with a native pdf viewer later this year for the Palm platform but it will still require conversion. It's not an instant read.
-KOPI: this PIM suite is far more advanced than anything on the Palm. Also, the idea (it's an idea as I have not tried it yet) to be able to have the identical data on my ubuntu laptop, my 3100 and my windows xp box is pretty cool. Synchronising the t5 with a linux laptop is buggy most of the time. For all I know , synching KOPI might be even more buggy.
Overall, the T5 is buggy with frequent resets. Still within acceptable tolerances of stability, but just on the border of being too buggy.
Thanks