I fiited Koni's to my cossie 13 years ago and they have been great still as dry as when I fitted them and still damp perfectly
The only trouble I've had( as I use it as a Daily driver in the Summer months) is the spring platforms have had to be repaired as they rusted badly due to the poor paint they have on as standard so I would advise a few coats of smoothrite or simalar on top of the original paint