OGG owner here
I've ridden around in mine for eight years now and I still think it looks fantastic. To be fair I think all the metallic greys suit the car well, and the subtlety of the differences betwixt them will be lost on the man in the street.
The attraction of the opalescent colours is that the way the light plays off then emphasises the curves of the bodywork, and with gunmetal, particularly in strong sunlight (of which I imagine you have an abundance where you live

), the car essentially renders down three colours: silvered highlights which tone with the chrome trim items; the grey itself which provides the colour and serves as a transition zone; and then the dark shadow areas which tone with the tyres and rubber trim items. Very harmonious and very attractive. There's also something wonderful about the way the reflections make the bonnet melt into the sky when you're sat behind the wheel driving during twilight on a clear summer's evening.
Personally I haven't found that the colour serves as a 'numpty magnet' any more that any other colour - as anyone who's ever tried riding a bike whilst wearing hi-viz yellow will tell you, you could be trailing red, white and blue smoke like the Red Arrows and still people will take it upon themselves to pull straight out in front of you!
So basically it gets (and continues to get) the thumbs up from me. And as an aside, as it's quite an understated colour, you might want to consider stove-enamelled wheels, which are a bit less shouty than the polished chrome/stainless equivalents and therefore harmonise a bit better.
Simon