Disadvantages are its weight is heavy and thick, plus a trackball navigation key that is often complained of jams after a while worn.
Blackberry next series had long left the trackball and use a trackpad that is more sensitive, responsive and trouble-free.
For the battery, usually due to the reduced endurance 3G feature is always activated, though the nature of the Blackberry is always connected to the internet at any time.
That is a drain on battery power.
