I found the same thing with my Workswell, as to stiffness. it takes the chatter out, but the knocks are definitely Knocks. I cannot stay planted on the saddle when I hit big bumps.
The plus side is that the bike responds to each pedal stroke (or so I imagine.) I think I try a little harder because it feels more rewarding.
Okay .... now I am all worked up and have to go ride.