I think I know what Cain is referring to.
In practice if one driven wheel has no grip, say ice or mud, the drive will not pass to the wheel with the grip, as it would with a plate type diff.
I have never rated this type of Limslip, for this very reason, for example, pulling hard uphill around a tight hairpin bend, the inside wheel will spin uselessly, but no power will be transmitted to the outer wheel until more grip is found on the inside, the very time an LSD would be essential I would have thought. Right Cain?
