Well where to start... When i had my coust pads on they worked OK nothing special didint really hold they had very good bite but that was about it..maybe i didnt give them long enough to bed in . My pads came all wonky I thought nah they'll be fine , so i rode with them for like 30 mins . Then the next day went out for a full days of riding only to be told my pads where going to come out of my backings... So i took them off puit them on the front and put my koxx browns from the front onto the back..So that's that.Got home thought well i may as well check if they where telling the truth about them just about to come out of there backings so i pulled on the material on one of the pads and bang came straight out,didn't even pull hard.. But fatmike has said if i send them back he will re-glue them for me but still.. And my mate has the heatsink ones.These look good and are all fine backing/cut wise yet his dont work for shit. He has them set up fine , bleed's fine he has a fresh grind but he does use a try-all rim wich i think may be the problem but they dont hold for shit for him,the other day his sliped whislt he was hopping on the ground , now not being funny but thats bad but of course thats nothing to do with steve as he didn't design the material or owt so you know. anyway rant over .