"rides very nice" is really inconclusive.
I have been in many peoples cars who feel like they have a nice ride, when in reality its an underdampened nightmare. Sure there are no harsh bumps, but any time the spring ossolates the car continues to bounce up and down for a good while.
That is not a nice ride, that is a bouncy ride.
I have been to several track events on the KYB's and they are most definetly underdampening. Ride in a car with a quality valved shock for the rates and its easy to tell the difference.
Hell, even Koni Yellows are only valved to handle about 400 - 500ft/lbs, and the neuspeed are dangerously near that limit.