I've tried the Motorola Q, and most of the Treos. Without a doubt, the Blackberry 8700c is the most reliable pda I have tried to date.

The device isn't great looking, and a few of the commands are a little clumsy. I think it would be especially clumsy if I were left handed since the wheel is designed to be thumb operated. But, it is reliable. The phone and speakerphone work well. Email is pretty easy, although I had some trouble using the desktop redirector. Once I switched to the Blackberry server, email was much better and my calendar stayed synced with Outlook. The only negative with syncing is that you have to connect your phone to the computer keep contacts in sync. The final negative is there is no camera. However, for a phone that does speakerphone, email and calendaring it is the best I've used by far.