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I've seen a lot of complaints about ASS, but I am not one of the complainers. To me when the engine restarts it's a fairly subtle sensation. I'm not sure if it just works better on my X1 or if others are very sensitive to the car restarting at all. I certainly wouldn't call the sensation a "shudder," as I've seen others describe it. Maybe it also has to do with how you depress the pedal. I'm not a driver to "blast off," so maybe because I take it easy there's less of a sensation.
At any rate, if I am coming to a stop in a situation where I expect to otherwise be idling for a minute or more, I let ASS engage. In other scenarios, I ease to a stop and ASS does not engage. It's a matter of feel. Very rarely in true stop-and-go traffic on the freeway I will click ASS off. Otherwise, I go by feel.
And in busy Los Angeles, my sDrive mpg average as I approach 30,000 miles is 28. Happy with that, and at least a fraction of that is due to ASS, I would bet.
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