I think it's a good feature in theory but in practical use it's awful. I used to try to use it but gave up pretty quickly. Too many shutdowns when I needed to move again right away and most of my commute is on a cold car so it didn't even work until warmed up. Having no engine running while at a stop never bothered me though. We also have it on our X1 and I had the dealer reset to default last setting instead of ON. We leave it off at all times.
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