After almost a week with my new Treo 650 GSM on Cingular I have to say I'm more than happy with the devise. Of course there are some issues with it but overall I think it's a solid phone with great PDA functionality.

Pros

• The Speed - This thing is super fast on the web reaching speeds of 140kbps
• The Screen - The display on the device is really beautiful making using the device a pleasure
• Integration - This is both a positive and a negative. It's great how well integrated the PDA and phone are but I have a problem with the Versamail email client.
• Bluetooth - I tested Dial Up Networking and am happy to report that it works. It's not the easiest thing in the world to set up but once you're connected it's pretty quick. I was reaching speeds of around 90kbps with my powerbook.
• The Keyboard - The keyboard on this device allows easy typing and can be "hacked" to speed the input of capitals and special characters

Cons

• Versamail - This email client has proven itself somewhat limiting as it will not properly sync with my IMAP folders. It also has trouble with CC and keeps resetting my device
• Price - This device was VERY expensive, even with a new contract from Cingular
• Palm Contacts Application - This application does not store data as flawlessly as the Apple Address Book and therefore does not sync well with it.

As I said, overall I'm very happy and can see this phone working out well over the long run. I need to either get Versamail working properly or change email clients though because the lack of proper email usage may be a deal-breaker