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I have seen plenty of guys racing post classic in Australia using Koni or Ikon shocks, i have used them for over 30 years and when set up properly are excellent shocks, i used to ride the wheels off mine and never had any problems at all and they are rebuildable. I also had Koni suspension on my Aussie muscle cars, rebuildable also..
Mick
Mick,
I have never tried Icon but have had many Koni shocks on my bikes/cars. From my experience (400F, R80/7, CB900F, many CB750Ks, and a few cars ) Koni shocks always had too much high speed compression damping, and benefited significantly from a re-valve. Having said that, at least it is possible to re-valve them, and given what else was available at the time they were one of the best options. Early Ohlins (1982) were not very impressive either, suffering from the same problem as Koni. I have Konis now on two of my CB750s and I will be re-valving both pairs.
--Nick