When you buy a bearing made of the same materials as the ones that were originally failing, why would you expect different results?
Ball bearing IMSBs have been proven by thousands of installations to have lots longer life if made of the right materials, installed with the right tools, and if they are done carefully using the right instructions. Some are now even expected to be life of engine in normal use meaning you might get a couple of clutch changes out of one given your use of the car.
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