I have a 19 and rarely notice the start/stop system. I had to tell just about everyone that was in the vehicle that the engine was shutting off and starting up because they didn't notice it either.
The engine stops immediately, it does not have to be an extended stop. It also is usually smart enough to not stop when you are at a stop sign. It will start up again when it sees the vehicle in front of you start moving or if you take your foot off the brake.
I have not seen a need to turn it off but it is a personal thing. My brother also has an X5 and the start/stop bugs him but not his wife when she drives.
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