ofcourse, sound (with a headset) is one of the most powerful 'weapons' in this game.
I have ninja on all of my classes, because it silences my footsteps, I hate hearing my own footsteps.
Same with silencer, all my 'good' classes (for playing against good players) have silencer.
Both for rushing (ump45) as non-rushing (scar-H)
"Holding anger is a poison. It eats you from inside. We think that hating is a weapon that attacks the person who harmed us. But hatred is a curved blade. And the harms we do, we do to ourselves."-Mitch Albom