Pros: Excellent form factor;
Long battery life;
Fully sync with MS outlook (calenda, contacts, emails, tasks, etc.)
View/Edit MS Word and Excel files
Cons: Speakerphone is so so.
Microphone -- The other side can barely hear me. This is a known issue with treo 650. I have to use bluetooth headset or earphone to bypass the internal mic issue.
Summary: This is my first Palm OS device.
I have been a Windows CE fans for many years, and have had multiple IPAQs and Microsoft smartphones. I am a Windows programmer and was hesitating to switch to Palm device (thought Palm OS was not as sophisticated as Windows) at the beginning, but I am very happy with the features of my treo 650. Palm OS consumes much less battery power than Windows OS.