It's certainly a partnership that has a lot of potential.
Bonucci's composure and passing ability provides a good balance to Chiellini's no-nonsense approach.
The main thing Bonucci needs to improve on is his ability to deal with players running at him.
Just now, he gets square to the man (when he should be side on), which means he is fucked if the forwards knocks the ball past him, because he has no chance to keep up due to his body being in the wrong position to start running.