^^ I know they're the same wheel (which has now had three iterations on the MKIII Focus), and I FAR prefer the 2013 gunmetal version - but I don't mind the black ones on SGM.
Now, if I could convince the dealer to swap the gunmetals on for me - or find a current owner to do so - I'd do that in a heartbeat. But, with SGM only (and okay, perhaps white), I sure as hell wouldn't PAY to have the gunmetals over the black. Although I hate black wheels, those really work with SGM and white; the machined part helps the look a lot - mitigating the blackness.
But if I get an ST instead, I will be swapping the OEM 18"s for the 17" gunmetals as my full-time wheels immediately.