.they do make noise but you can also buy dampeners its the bottoming out that makes the most noise
Red and Blacks I know are linear so the only noise they make is from bottoming out. but by using these> http://www.wasdkeyboards.com/index.php/cherry-mx-rubber-switch-dampeners.html
the sound can be all but eliminated.
dampeners are good idea cool Its worth the work I know those mech boards are great ..