They are terrible, stay well away!!!!
I got the Kevlar uprated one for my car and it held no more than a standard clutch before slipping! They came back to me and said it was only rated for 30% over standard engine output, not 30% uprated as per the adverts. So that would offer me 299lbft when a standard clutch can hold near 400lbft.
Don't waste your time and money, get a Sach one. The Sach clutchs have specific NM ratings and the factory tests them to 10% over that rating, so the 500NM one I am waiting to fit now WILL hold 550NM+ and people have run near 600NM on them.