I do not but I have seen alot of them around, they seem very handy being able to put appointments into them and everything, I just wonder if holding it is hard.
I had a Blackberry and absolutely loved it. But I'm using Top Producer and it's only on Palm. So TREO 650 I have. The Blackberry 650g was fast, light, and reliable. My Treo crashes a few times every day. And...it's my fourth Treo in 2 months. The phone kept resetting itself every few hours to a point that I couldn't make a call.
I have had a Blackberry and a Treo 650 - I recently switched to the Samsung i730 and LOVE it!
It is Windows based, so I have access to all of the Office programs. I also have all of my IM links going directly to the phone (quick replys to web queries) from my website.
Easy to use - easy to sync with my laptop/desktop.
Treo did just release the PocketPC version, that makes it on par with the Samsung - although I like the Samsung keyboard better.