I tend to stay up in the north, along 121 and the tollway and NOA works quite well. Traveling southbound on the tollway, from Frisco, to northbound 121, for example, it prompts me well in advance to move to the right in anticipation of the 121 exit. The car then automatically signals and takes the 121 exit, successfully navigating the split where one chooses 121 northbound or southbound. Then, when the exit ramp merges with the people going from northbound tollway onto northbound 121, NOA successfully manages the merge, slowing and leaving a space for the car in front to slip in.
I wish NOA were even more aggressive about recognizing lanes that were moving faster and prompting me to move into them. It seems to recognize such opportunities about half the time.
All in all, I'm very happy with NOA up here in the Frisco/McKinney area.