Durability is better than old system. Bleeder hole is now marked into the plastic. You have to drill it with 1mm. Plastic itself is rock hard and it's a pain to put the new 5.8mm balls on it. You have to use the long V-parts for the 419x arms because of outer hole position, or damper retainers will collide with lower arms, especially in rear. But it also alters the way how the dampers work. If have to test on track, if it's good or bad.

The 5.8mm balls have little play in the the plastic caps on the axis side. I can move damper ~1mm back and forth. Don't know if this is a new "feature" to become dampers more free in movement or its a fault of first batch. Other tolerances of parts are very tight.