I am relatively new here, only a few weeks. I came here looking for info on the Blackberry because I never talked to one BB owner who disliked the phone. So far I have owned about 8 Treos (some of them broke). I was reluctant to change because that's the way we are, go with what you know. I am writing this because there was nothing like this post when I did a search for info before buying an 8830.
Do not be afraid. Walk into the light! The BB is easy to use and is ten times better than the Treo, including the 755 which I returned to buy my BB. I have business partners who thought I was nuts until I highlighted a phone number in a meeting note and dialed from it. "Hey, how did you do that?" one of them said. "Yep, and it actually works with the Bluetooth in my car too" I told them.
Anyway, just go buy it. It will be OK.
Chuck