I've experienced it slamming on at slow speeds and it's pretty aggressive.
IMO, all the vehicle's other convenience electronics are no-gos too. The lane keeping sensors trigger randomly and uselessly. Clearly the camera is unable to find the lane markers reliably. I turned off the service after less than a week of ownership.
The auto-high-beams work poorly, often leaving the highs lit even though headlights are clearly approaching. So I have to remain constantly vigilant that I don't annoy others, AND that it hasn't turned itself back on automatically.
Even the turn signals can't be stopped easily. Neither pulling on the stalk nor cross-signalling will stop the blinking once it starts. Cancellation seems to require about 8 additional blinks before it finally does stop, leaving me wondering which of my actions actually worked. After 5 years of ownership, I still don't know what the right magic incantation is for something that should be dead simple.
What's the point of e-conveniences that are inconvenient?
Try not tailgating. Try not switching lanes when it's close. Your car will stop beeping at you, and you'll also save yourself a lot of money in the long run.