Never said it was the same as a vLSD, but viscous coupled nonetheless.
I agree that for a primarily street driven car, there's really no reason to upgrade. If I were to choose though, I'd take a regular clutch type or torsen over the m-diff. I think wheel lift and thus open diff situation with a torsen/quaife is a non-issue for most. Even if one hits a curb or bump at speed, the car needs to be rather stiffly sprung to lift in most situations.
Off-topic, any opinions on the brake-steer on the mclaren. They didn't even bother with a LSD.
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