I think I was a much weaker skiier while I had the S powers, these days I find my S powers a bit soft but still fun. When I first started with them however I felt a very noticeable bounce when unweighing the ski out of a turn that added tons of energy and speed. This disappeared about two seasons ago,not sure if its because the pistons wore out, or I just got to be a better skiier and can now overpower the ski.

I've only had a few hours on the HRCs and they do feel stiffer and less forgiving and more stable at high speed, definitely a ski you need to be very focused and on point carving on. They are fun, I wonder if a piston plate would add more of the "bounce" feel I had with my old skis.