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For an extra $150 it's a no-brainer. You can always take it out and keep it aside if you need the trunk space. If you ever change to non run flats in the future, you will have the spare available. Buying it afterwards on its own is around $900.
That being said, I have non run flats and the spare tire on my M550i. I have never needed the trunk space where I had to remove the set up. I did remove it once to see how it worked and it's a quick and easy removal and reinstall. Around 5 minutes to take it apart and put it back together.
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