I've been running stage 2 for about a year now and still working great even after seeing the track a couple of times and many thousands of miles. But if you are a gentle driver then the stage 2 might not be the best for you as they do need a little bit of heat to get the best from them. And in summer when they get really hot and on the track they are just fantastic! Really responsive and no fade even braking from 100mph time and time again.
Dont forget to bed them in properly which does take a long time from my experience...