I admit the metal button looks pretty decent. However I have to say that I've grown used to the clear one and not having a metal one is not an issue for me.
Something else to consider is that the clear button lets you see how well you're lined up with the internal button on the circuit board. You'd have to rely completely on the screen to determine if your board has shifted which is not as easy to do (unless it's a significant shift).
At the risk of sounding excessively suspicious, I have to wonder if Sigelei's marketing people introduced the metal button so that minor shifting of the internals isn't as easily noticed if the button still functions (and therefore reduces complaints?). I don't know, I'm probably way off in left field.
At any rate, I'm still hoping Sigelei will add more support for the circuit card in future models which will put the problem to rest permanently.