If the problem is lack of heat transfer then when you get the judder no ammount of wheel changings going to fix it because the discs will be knackered by then causing the judder. Only new discs and a wheel change will prove the point and that may well need months of driving to ensure the problem is fully sorted.
Personally I find this hard to believe unless you guys are driving to the limit and hammering the brakes to within an inch of there lives.
WTF are BMW saying here 'We fit wheels we know will cause brake failure'.

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If it is true BMW should be fitting disc/pad combinations that can stand the heat. No excuses....I would call watch dog they have already had a go about wheels cracking they would love this.
