I've only experienced the intrusion of ETS once with our ML320, but boy did it do the job.
Four of us were driving through the mountains in a heavy snow storm at night, hoping to get to our hostel and a good nights sleep before skiing in the morning.
I was in the middle of nowhere, taking a big curving off-ramp from one highway to another. Just at the apex of the curve, I felt the rear end start to slide. There are no guardrails, just a big drop down the side of an embankment. Before I had time to yell "sh_t", I felt the brakes apply and the car jerk back into line.
I was absolutely wide-eyed and everyone was staring at me...they hadn't noticed a thing. It was a few minutes before I could tell them what happened.
