My new to me CVT Jazz will have it, on a manual Qashqai it seemed overly wanting to stop the engine, so that you'd stop at traffic lights, for example, which were on red, and of course once stopped and handbrake on the engine stopped, and very frequently the lights would almost immediately change and so the engine would start up again. Got to the point where I was switching it off as it seemed to be making me think about how I was to use the car to use the feature properly, rather that it being an aid.
Don't do much city driving and so the amount of fuel it saved was small, if I was driving only in cities, then I can see it'll make a difference to the pollution levels and my fuel consumption.