It works very well with the 6MT in city driving (i.e. red lights). By the time you push the clutch in and move the selector to first (both done simultaneously), the engine is started and you move like you would have if it had never stopped running. Its worth depends on how long the lights are, and how many you encounter during your regular drive.
However, this feature helps with the EU's C02 emission testing process, so it's a no brainer for BMW and other European manufacturers to integrate into their newer products. Just be happy that there's an on/off switch.
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