It is usually used for racing applications, and not recommended for street use. Most kevlar clutches have a heavy pedal, and will wear out your left leg in stop-and-go traffic, plus a lot of chatter.
I've been running one for 3 yrs, the chatter in my case has more to do with a nearly solid hub which is why I suggested a fully sprung hub to allow a little more engagement time to prevent it as I can engage the clutch without the noise but using a little more effort. Pedal hardness is determined by the pressure plate so if the stock plate is used it will not change.
[This message has been edited by Joseph Upson (edited 11-09-2014).]