I was thinking about how the action on this particular knife might compare to some knives that I know you own, John. The Waynorth Lambsfoot is probably one that might make for an apt comparison - similar pull weights and such.
However, the differences in construction certainly make for subtle differences in feel. The Viper uses washers and has a stop pin which I believe contributes significantly to the differences. Where the WCLF has a nice crisp walk-n-talk and the snap seems to reverberate through your hand, the Viper is more muted (if that makes any sense). The pull is more than satisfactory, in my opinion (rating a 6-7, I think), and the action is not unpleasant, it is just different.
The different materials and construction methods likely cause the energy from opening and closing the knife to be dispersed/absorbed in different ways. I think it makes for a unique experience - one that is not at all unpleasant.