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After the theoretical debates with their lack of quantification and test data are over - there has been some field experience reported with Roller Bearing IMSB's.
To my surprise it has been positive so far. Only a few reports so far and IIRC only 10,000 miles.
Of course that little data point should be balanced against the experience with deep-groove ball bearing IMSB and the famous plain bearing alternative.
Considering the amount of work+ collateral damage from any IMSB failure, I am surprised people take any risks.
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