aparch
Acetaminamerican
I've driven a Jaguar with it. I hated it. I shut it off. It unnerved me; when I'm stopped at a light I want to know the engine is running, not wonder if it's going to start when I need it to. (PS - Jaguar has release brake or turn the wheel to start.)
And I have my doubts about wanting the engine off when it's -5 F (or -25 F or +105 F).
The Malibu won't let you turn that feature off (my only complaint with the car).
If the heat/AC is working hard, the engine won't turn off. I can only think of two times it did that last winter. And maybe a half dozen times this summer, but that was because I had the AC set to eco mode so the car would start/stop. Never did it stop when the AC was blowing normally.
GM had one feature in the Eco model the year prior to my car (my Malibu is the normal edition) where the start/stop battery could jump start the regular car battery if the regular battery died. I wish that was a standard feature. (Yes, my car has two batteries.)