I haven't used anything other than the plastic one. It's never going to be great as the diff plates don't centre on the axle never mind what the hub does. I sanded the diff plates, fitted two bellville washer, fitted the full complement of balls and my diff while not as smooth as the one in my 12th is fully functional.
I'm still fairly in the camp that Mardave or now GT12 should be as cheap as possible so I don't run any of the alloy, carbon or GRP hopups and my car goes fine.
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