I am new to the BlackBerry and have had a mobile phone since mobile meant mounted to the car.
My BlackBerry is on a T-Mobile BB plan with only 60 mintues of talk time. My primary mobile phone is from Verizon Wireless with an annual bill equal to the GDP of a small third-world country.
I like the option of being able to talk on the phone and navigate any BB functionality I want or need.
I have to say however, that I also still carry my IPAQ 4355. I have too much info and third-party apps on it to switch. After being a BB user now for three weeks, I am definately addicted to the unit and I find it to be elegantly simple.
Some company needs to be smart enough to take a unit with the 7700 form factor and marry that with a Pocket PC with an SD card slot and I couldn't think of a better all around PDA/Messaging device. A combination of the hardware design of the BlackBerry with the functionality and expandability of the Pocket PC would be hard to beat.
I would still carry my VZW phone, but I would sell my IPAQ in a NY minute.