If you're thinking limited slip, I can tell you from first hand experience, that a Quaife will slip. I've heard that the VWMS one doesn't because it's a different design. Problem is, there aren't many around for 020 boxes, and the ones I've heard about are about twice what a Quaife costs.

On the other hand, there are several people who do very well w/ welded spools w/o significant driveline wear/failure. They do take a different style, but they don't slip!

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MARRS #25 ITB Rabbit GTI
SCCA 279608