Not very good at all, I've had similar issues in the past with Mercedes S Class and Lexus GS alloys: Mercedes were very difficult despite the car being bought new with a full history. Lexus, no argument from them just a new set of wheels.
Perhaps not enough paint leading to porosity and then corrosion.
And just to rub it in the Rigels on my 1986 745 are in better condition than yours!
Jon.
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