The action on mine was very good right out of the box. I swapped in some Skiff Bearings (5mm, 1/16", 11-ball) and got it dialed in just right. Now it is incredible.
Between the action, how it carries, and how it feels in hand; I've really been blown away by this knife. I wasn't sure if I'd like it and almost didn't buy it. Now I'm really glad that I did.
My only complaint was that the top edge and corners of the lock bar were a little sharp. I fixed that with progressive grits of diamond file. Now I've got a little shiny spot across the top edge of the lock bar. I usually don't worry about that but here it will be just the excuse I needed for more mods. At the very least, my grey model might get anodized to bronze.