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The 4/40 is a conservative estimate placed on the single row design. If it were like a wheel bearing and initial failure just means it gets noisy I'm sure that would be extended. However considering the quiet, catastrophic nature of ims failure a very conservative expected part life is a wise choice to protect product reputation
I totally agree that for a DIY the purchase of the two row upgrade requiring the faultless tool makes no financial sense to the end user. That money would buy the ims solution and not leave $700 gathering dust in your tool box
I would only add that the single row ceramic is surely better than the OEM.
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