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Not on X300, but I had them on an XJ40 some years ago. They looked good but a proper PIA to clean.
One other thing to research before you buy would be tyres. The original size on the XJS which these would have come from is 235/60/15. This size is rare and consequently very expensive for premium tyres. You might be able to find a different size that keeps your rolling circumference close to original.
There was a 16 inch version of these fitted to some XJ40s as OE. These would be a better bet but I think they command a much higher price than the 15s. But if you look at wheel/tyre combination price they may work out better.
I always liked the lattice wheels on the XJ, even better than the Dayton wire wheels. Not much of a fan of the lattice wheels on the XJS. Too bad they didn't make more of those 16 inchers for the X300s.