My old ZS had runflats all round (fitted by previous owner) and i never had any problems with them to be honest. Ride is abit more harsh and you have to check pressures more often as obviously the ZS doesn't have a low pressure warning system. You can still tell when a runflat has no air in though as it still looks slightly flatter than the rest.
That black circle link must be old now though as BMW are phasing runflats out due to them cracking the rims.
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