The b4 is as good as the competition. I would like the bleeder caps to have a oring for the screw. Could use a metal cap. I think the difference in the springs is that the Kyosho spring is progressive and the ae is linear. Could be wrong though. The other thing is the tolerances. Pick up a Rb5, not as much slop in the a-arms, wheel-axles, c-hubs. Please tighten up the tolerances and we'll have a more consistent world beater. I've owned AE's for over 30 years. My original and still running RC10 doesnt have the slop of my b4,and b4.1.
Come on AE Just better shocks and we have the greatest car still.