I've run the Losi and Answer pins.
Never had any issue with either til this past weekend; but have never stripped or broken any.
My issue was that the threaded section of the Losi pins were too long and went too far through the main support head/threaded section and contacted the hole in the shoes; thus completely LOCKING the clutch up.
This is not overtightening anything; simply "bumping them down" would lock the shoe down (with no spring on it for testing purposes).
I didn't have any more Losi pins, so used some Answers with no problem.
I've never encountered this with Losi pins before, but def. something to look out for with any of them.