As someone who modded his controller with metal buttons. Instant regret. It is not comfortable for extended gaming sessions.

Now you can smell like pennies

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.