I like Chung and would spend our #2 on him if he was available and someone I would prefer wasn't.
What I like about him is he is very aggressive, he is a workout warrior, has a motor that doesn't quit, he is a very good tackler, and he likes to punish people.
What I don't like about him is he is shorter than I would like at 6', he isn't as fast as I would like, while he can cover he could have issue with bigger receivers.
Sometimes he is overly aggressive, but that can be taught. By overly aggressive think Troy Polamalu and how his aggressiveness sometimes makes big plays, and sometimes throws his defense completely IN FRONT of a bus.
I liken him somewhat to Roy Williams when he came out, except he DOES tackle, not just hit a player so hard he falls down as Roy has been known to do.