Depends who you are talking to and how many bragging points you are after. In working order they are not a bad unit at all. A specialist in Derby was saying that most modded RSTs will be fine with 4WD calipers/2WD discs and with Series 2 rear drums on the back.

Put it this way I went from Wilwood Dynapros to the aforementioned setup. There was no comparison in braking ability. The Wilwoods arguably gave a better pedal but even when stamping on them did not slow the car down that well. The RST now stops very very well on the Cossie setup, even when it was bedding in the car never came so quickly to a halt!