My very first car was a 1986 Lincoln Town Car. It had cruise control (or at least it had the cruise control hardware and software). You could turn the CC on, set the speed, coast, and purportedly turn it off all from the steering wheel. According to the manual, a light tap on the brake pedal would also disengage the cruise control.
Great! This would come in handy on the long trips between college and home (didn't use it any prior to college). So there I am, going down 85 happily cruising at my set speed when I see traffic stopped up ahead.
I hit the "off" button... nothing.
I tap the brakes... nothing.
I hit the "coast" button... nothing.
By this point I'm approaching the traffic and would have liked to already be under braking. So I do the only thing I can think of and *stand* on the brake pedal.
I literally feel the cruise control disengage and then the car instantly goes into brake lock (no anti-lock, disc front and drum rear).
Luckily, there was no incident and the only damage was the streaks left by my tires (and maybe in my underwear!). I did get some curious looks though.
As such, I've... avoided using cruise control ever since.
That being said, I LOVE TACC. It was great on our trip to NC. It's great in Maryland traffic. It's great and has only gotten better. It's also a huge "wow" factor to passengers. My friend who drove down to NC with me acclimated to using it almost immediately and almost preferred driving the car under TACC to full control (almost).