I have RAD locks on my Audi. They're now all nasty and corroded looking, in spite of how they're hyped as having some kind of fancy finish.
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All RAD bolts feature Dacromet coating, a specification required by Mercedes Benz, which results in a dull gray finish that lasts for years.
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That said, they're still structurally sound & fully functional. I did track with them in, so they've been subjected to non-street conditions. However, the OEM bolts I use them with are still clean.
For winters, I use the RAD 2-piece bolts on the same car (my BBK requires spacers for the OEM wheels, which I use for winter, so I needed longer bolts). After 2 winters, they still look fine. I don't use the plastic caps.