The existing buttons are made out of a plastic that wears well when rubbing against their contact-points in the case. The plastics are chosen to be compatible, self-lubricating and “not spalling or rubbing eachother to death”.

I doubt that these metalized buttons have been tested for their long-term wear characteristics.

I like the color of copper, but managing cupric oxide would be a potential headache, especially if it flakes off into the electronics (which it is likely to do on a moving part, like buttons).

You could possibly mitigate this somewhat by running the buttons through a polishing tumbler with burnishing media, but it would give me too much stress knowing that even this isn’t 100% effective.

These aren’t full metal buttons. They’re a hybrid resin and aluminum or copper mix. So less of an issue if it was a full metal button. You can customize it through polishing it desired, e.g., a brushed look, fully polished, raw (as it comes packaged). And yes, your finger oils will add to the end result as well.

It looks cool but I wonder if they are comfortable to use?