I'm typically a lurker, but just had to respond to this thread...
I decided to make the switch from T-Mobile to Verizon last Saturday, specifically for the Treo 650. Monday evening after work, I stopped by the store to exchange my Treo for the BB 7250. Why?
1. Most of my friends on Verizon tell me the network is rock solid in the Chicagoland area, but my Treo was dropping calls left and right. One of those calls was even made in the Verizon store.
2. SMS messages were being sent twice by the device. I spent an hour on the phone with Verizon support trying to determine the cause of this problem. The issue got escalated a few times and I did some troubleshooting with an engineer. He eventually determined that the device itself was duplicating messages and said I could exchange it at the store. Btw, all of the support people I spoke to were very friendly and helpful in resolving this issue.
3. Versamail wasn't working the way I wanted it to. I scoured forums for settings to check my Gmail wirelessly, but none seemed to work. When I synced with my computer via USB cable, Versamail still was not able to download anything from my Gmail account.
4. My Jabra bluetooth headset could not maintain a connection with the Treo. It would constantly disconnect and not be found again.
After having all of these problems and more, I decided to just pass on the Treo and exchanged it for a 7250. I have NONE of these issues with my Blackberry and have really been enjoying using it. In fact, I'm using it enough to make me think that 10MB of data is not enough and I may switch back to T-Mobile to get the less expensive unlimited data plan. FYI, I was a Palm user several years ago, switched to Pocket PC, and now I'm using the Blackberry. I absolutely love how this device integrates everything I use so well. Now I just need to learn all the shortcuts so I can do things more quickly...