I was a skeptic too, being a Palm/Treo/PPC fan... I've had many devices, per the list on one of my Blog postings (close to 50 PDA's in the past ~10yrs). And I have (in the past) been highly skeptical of the Blackberry's adequacy as a "GTD-able" PDA - for a couple of years now (this is my third BB since 03'; I returned the first two after trials).
So it is with some surprise that I find myself (after giving up on Treo 600/650's after 9 devices, as documented over 18 months on www.treocentral.com) jettisoning the Palm/T5 and becoming satisfied with the Blackberry7290 as my core PDA/GTD portable device. I'm also benefiting from all the extra time being "Palm device/PPC-less" frees up - it's nearly as god as going back to pencil and paper, or (forbid) Moleskine notebooks and index cards
I suppose it's also influenced by happily using Outlook a lot on a VAIO S360 subnote and shifting my expectations as to the PDA/Smartphone, as it is about the Blackberry getting better.