Until 2006, I didn't have a cell phone of any kind. Now I have the Blackberry Curve. I mostly use it for e-mail and calendaring. I got to the point two years ago that I was forgetting a lot of appointments because I was so busy all the time, not all of which I wanted on my work computer, so I opted for the Blackberry. I also didn't have and didn't want a home computer, so it filled in the blanks there, too. I really like being connected with work 24/7. My job isn't THAT intrusive as it is, so the fact that I'm always reachable isn't a big drawback for me. It's also helped me feel less anxious about being out of the office since I can still stay in touch. I really like having it when we travel. We can look up directions or restaurants or check the weather.

I can't answer for you whether it would be worth the extra cost. For me, it is.