Another Blackberry fan signing in. I too was a long time user of Palm OS (right from the days of PalmVx) toyed briefly with WindowsMobile on an O2 device but am now a certified loyal Crackberry user (at least for the last 6 months or so).
There are some areas where PalmOs/Treo is better but there are other places where Blackberry rules. First is stability. After a couple of months use my Treo 600 was prone to crashes and restarts, but Blackberry is still going strong (however I must mention I had a trackwheel problem but my service provider was very quick to replace the handset).
Secondly I love Blackberry's feature of having unlimited categories. I would go really mad each time I'd reach a 8 category limit and then have to consider reassigning certain categories in my Treo. Furthermore Blackberry's syncing with Outlook is extremely tight. All Contacts, Appointments, tasks fit neatly into the right fields and categories in Outlook, (Don't quite recall how good Palm's syncing was with Outlook, but the way Blackberry syncs is certainly exceptional).
Finally, the really beauty of having Blackberry is when you (or your Office) install Blackberry Server. Too that it is simply awesome, is an understatement. It gels just so well with the GTD philosophy of not having to think about the system and focusing on actually Getting Things Done. If you have the Blackberry Server installed all your Tasks, Calendar items and Contacts are ALWAYS in sync with your desktop. So each time you either Add/Edit/Delete a Task/Appointment/Contact in your handheld it is instantly synced no matter which part of the world you are in! This has been such a productivity boost for me. I make hundreds of changes to my tasks/appointments/contacts at my desktop (and my handheld) in a day and it's such a relief that after doing so, if there's a phone call and I have to rush to a project site (or back to office), I instictively pick up my Bberry and am still in control as my updated list next actions (my @car, @calls, @anywhere) is just an arm-length away.
All of this and I've not even talked about Blackberry's main USP of having your emails always at hand.
In summary 2toxic, I'm certainly quite happy with my investment in Blackberry and I think in a while you'll begin to feel quite at home with it too.
ps. Anytime you're stuck using your Bberry, feel free to message me, would be glad to help out.