I was worried about the wear and tear on my new car with this feature, but I have a lifetime warranty on everything with this car (and plan to use it fully).
My biggest issue is how the air conditioner and heater shut off while the engine is off. That’s really annoying and I turn it off on really hot/cold days.
I do notice a considerable amount of extra mileage than I get when I turn it off; like an extra 80 to 100 miles.