The all-important real world test.
Anyone in America who has a BMW M4 convertible is probably still breathing in that sweet new car smell. So now is the time to take them to the track and see how they perform out in the real world. Here we have a video of just such a test. Unfortunately, the launch control isn't used here, which we would have liked to see. We would really like to have seen a comparison between these non-launch control times and times while using it, but so it goes.
The times are probably right about where you'd expect them to be, but it's still the kind of thing you want to see confirmed.