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100-200 miles over will probably be fine but, at least as far as my wife's MINI was concerned, the oil was very well cooked at 1500 miles and had quite a pile of metal shavings sitting on the magnetic drain plug we installed at 200 miles.
I would not personally push break-in service very far out at all, and will be taking my car in right around 1200 miles, if not a little early. The oil they put in the M3s may be higher quality than what they put in bog standard MINIs, but some metal shavings will still be there regardless of the quality of the oil.
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