Thanks for that update.

I’m not surprised that the complaint of this reviewer is that the system is too conservative.

I think these systems will tend to be adjusted that way especially at first. When the engineers get more confident they will allow sportier assistance.

Here is a review from Automobile magazine:

“The most exciting is Brake Assist Plus (BAS+). Instead of trying to figure out if you’re initiating a panic stop just by judging how hard and fast you jam your foot down on the pedal (that’s regular old Brake Assist, which you get if you don’t order Distronic Plus active cruise control), BAS+ uses short- and long-range radar to determine how far you are from the traffic in front of you and what your closing speed is. If the system can tell that you’re closing in on forward traffic too quickly, or that the guy in front of you just nailed the binders, it will increase the brake force (only after you’ve started braking) with the necessary gusto to avoid a collision. We know what you’re thinking: I have eyes and a right foot; I don’t need some system to help me. Mercedes testing shows that almost nobody reacts as quickly as BAS+, though.

Another new technology that combines safety with comfort is the new Distronic Plus radar-guided cruise control system. Like the original Distronic system, it can vary your speed on the highway to maintain a safe following distance. Also like the original system, it’s far too conservative for urban U.S. conditions, so if you leave the system to its own devices (even set to follow as closely as possible), a steady stream of cars will file into the too-large space in front of you. The new Plus system adds the ability to brake the car to a halt and inch along in stop-and-go traffic. While we haven’t tried this out yet, we fear the system will once again lack the cutthroat maneuvering tactics of our fellow countrymen and leave users accelerating too little, too late to maintain the required two-micron following distance necessary to avoid getting cut off. Distronic Plus’s low-speed operation is made possible by the same short-range radar used in the Brake Assist Plus system”