I'm actually not a fan of it. Granted I've mostly driven older cars, without the wonders of ABS etc - but most situations that require heavy, unplanned breaking for me, are also times I really should have two hands on the wheel.

I'm not fundamentally opposed - systems that do it automatically sound like a fantastic compromise. I just think if it's dangerous enough that I feel other drivers need more warning than normal, it's probably dangerous enough that I should have full control.