Asus Zenbook UX501.. how are those *metal* keys for typing?

[omega3]

So the Zenbook UX501 15" apparently has metal keys for its keyboard. Are they really metal or plastic with a metal coating? How does the feel and typing action compare to classic black keys?

Second, how good are the internal speakers in comparison to for example the Dell XPS which have good sound for a laptop with clarity and bass.

Thanks.