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Bmw could be using an aggressive clutch disc friction material thats causing some of the issues, chattering most of the time is caused by hot spots on the fly wheel /pressure plate surface . The hot spots can be caused by slipping the clutch using it to hold the car still on an incline , or just slipping the clutch ,some folks ride around with their foot on the clutch the slightest pressure on the pedal reduces the clamping force of the pressure plate letting the clutch slip you might not feel it but it is happening.Clutch slippage equals heat and wear which is transferred into the friction surfaces of the flywheel and pressure plate . I am not saying thats what you guys with issues are doing .The combination of materials and sizes that BMW is using in their clutch package could
cause the issues as well . Smaller flywheels for either packing issues or quicker accelerating engines less friction surface area needs a more aggressive friction material which most of the time means faster or more wear issues .
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