The ones Ive had fitted are the race car ones (a friend of mine runs a Clio Cup team, hence the parts!). And they are running fine on std road discs. I tested them for the first time at Donnington and, on the back straight (before the S bend into the start/finish straight by the pits) I was braking hard from over 100 and they worked perfectly, every single time, with no fade whatsoever! On the road, theyre a little noisy but very good. Id definitely recommend them.
I can either supply you with a set or, if youre in the South East, get my friend to fit them for you. PM me for more info...