I couldn't take it anymore. While the BlackJack is nice to look at and the 3G stuff is kinda neat, I just wanted a device that worked well as a phone and email/texting device. After spending a month with the BlackJack, I wrote a letter to our Cingular B2B rep saying that the BlackBerry simply wasn't a usable device. The main reason was the terrible battery life, which is well-documented all over the place. Of course I had other reasons for not liking the device. The fact that it took me several more steps to do something on the BlackJack that I could do in a couple on the BlackBerry was one of the most bothersome aspects of using the device. I don't like having to install hacks on my device to make it easier to use, which you have to do with the BlackJack. There was a terrible typing lag on the device which caused me to constantly misspell words and made overall less productive. So I got Cingular to take back the BlackJack and I bought the 8700c. I'm not happy about the size of the BlackBerry, but it just works. The phone is great and I can email and text with ease. BlackBerry, I'm sorry I ever left you and I'll likely never go back to a Windows Mobile device. I've been burned too many times.
If you’re a BlackBerry user, make sure you check out the following web sites which offer great advice and are full of tips from other users.
BlackBerry Cool
Pinstack
BBHub
Also worth checking out it is pinppl, which is somewhat of a social networking site based around PIN messaging.