After using the PPC phone for a while, I've decided not to use it to reply to e-mail. Connectivity is the main issue. Sometimes the thing syncs up without a problem. Sometimes I can't connect at all.
What's most frustrating is when it quickly and effortlessly connects and pulls down e-mail.... then I type a reply (tap a reply -- kinda like morse code)... and then I click to sync and send my reply. Can't connect. It's very annoying. And it's happened so many times that I've decided to use the device as a reading device, not a writing device. I still like the larger screen form factor over the smaller smartphone screen. But I'm not going to use it as an input device anymore.
If I see an e-mail that requires a quick response, the integrated contacts feature is super. I can call the person back and address the issue.