Except that you give up the tighter handling the run-flats provide, because of the stiffer sidewall and BMW has tuned the suspension for them.
I have used both non-runflats and the OEM Tires.
The non-runflats give a better ride but you lose some sharpness in handling.
Wish I could find a non-runflat that gives the same handling.
Next might be the Michelin PSS or Bridgestone RE11.
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