As a gaming keyboard absolutely, as an office keyboard as well, as a custom keyboard fan mostly ;) Definitely a very good keyboard, but not a real custom keyboard. Very comfortable typing, good sound, good quality.
I replaced the DE keys with CH keys from another Asus keyboard. Not quite the same height and quality, but not really noticeable. It's "only" the number row and a few special characters.
However, I can really recommend the Azoth X, which takes it up another 2 notches! Unfortunately I don't have the Extreme, the price is just too much...