Eine kleine Öl-PumpeThe first time I saw the hydraulic damper was about 1996 when there was a photo (may have been the cover of the German SkiMagazin) of either Seizinger or Gerg on the podium. Between her ski and its Marker there was a strange something not resembling anything used back then. Nor even people producing Markers here could tell me and everything they found out over the phone from the German factory was "a new prototype of a race plate". Which was what I could tell on seeing the photo myself...
Not much later I was in the German factory and inquired. There were only a few pieces made of this "Öl-Pumpe" but they had the price: it was 1,400 DM which would be around $1,000 now. Just the plates, of course.
Some time later there was the first Piston Control both in the World Cup plate and in Piston Control bindings. It is undoubtedly "eine kleine Öl-Pumpe".
I haven´t ever used anything of it and don´t know any comparative onsnow tests.
As to "Bud Heishman´s home static test":
it´s nice and it gives some info and comparison but at the same time it lacks real-life conditions like flexed/counterfled ski and shifts in balance/pressure. I could imagine that in a realistic simulation some bindings might behave differently than on the workbench.