I have ended up fitting a rear disk brake made by
BRAKING for 2 reasons, 1) because my old one was completely worn out and 2) cause I happened to visit a bike show and they were selling them cheap at show price. What do I think of them? Absolute waste of time, they wear out twice as fast as the original one and guess what? They are supposed to brake better but there is no difference at all and they are should cool down better than standard disks, but its not true, if I stop after a ride the disc is so hot I could sizzle bacon on it and fry a few eggs on it too. Conclusion: I should have known better and so next time I will stick another Brembo back on it.
At least that is my personal impression of them, to me they are just fashion item that have made no improvement on the performance whatsoever.