This is like saying "I'm going to buy a car, is that a good idea?"

What do you plan on doing with it, what are your needs, where will your travel with it, do you need any special features like Bluetooth or voicedialing?

What kind of email setup do you use at the moment? Which Blackberry model are you considering?

I can't simply answer with a "yes" or a "no", it depends on a lot of factors.