So the Nissan ProPilot Assist is currently powered by the Mobileye EyeQ3 chip. That's the same chip used in Tesla's Autopilot 1 and the Mercedes DrivePilot in the E-class. To review, read this if you haven't already:
The War For Autonomous Driving: 2017 Mercedes-Benz E-Class VS. 2017 Tesla Model S
I expect that the Nissan version likely works close to the Mercedes implementation. The early reviews and first driving impressions from across a swath of journalists seems to indicate that is more competent that most ADAS Level 2 implementations thus far which places it roughly in the same ballpark as the initial versions of Autopilot 1 software and the E-class DrivePilot. There are some interesting caveats though... like it will only apply 40% of total braking force. This also points to a lack of competent journalists to cover the various permutations of ADAS that are shipping. For some of these writers, it seems the ProPilot is the first ADAS system they've driven... which seems to border on incompetence for an automotive journalist in 2017.
Anyways... better ADAS is always a good thing. Clearly there aren't enough people using even traffic aware cruise control due to the massive gaps I see every time I drive in traffic.