koni's on my s2 with -40mm Pi Springs was absolutely awesome, granted it was caged and bushed, but i left the koni's on completely soft, and it was the best s2 for smoothness and handling i've been in.

Granted i didnt through it round the track to find out how well it would fair on there, but as you say its not going on the track.

Granted it was firmer than standard, but no wear near harsh.