There seems to be a lot of excitement in Chicago. I think Nagy is going to do a good job and here's why:

As the KC Offensive Coordinator he had 
KC Offense ranked 5th...
6th in terms of points scored
7th in passing yards - which could be huge for a young Trubisky
9th in rushing yards - which could be huge for the Howard/Cohen duo.
He also led the NFL in fewest turnovers. 

Just based on stats, it's clear the guy knows what he is doing, and is a good match for a young offense.

I will post my thoughts about him as a person, and his fit for Da Bears later today...stay tuned!