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The RS is slightly more expensive than the PP but I will recommend it to anyone looking for speed control for their Yamaha and especially the 210 FSH.
I may be the anomaly (or the problem is two weak TR-1 engines trying to pull a rider) for how well the Perfect Pass algorithm works but the Ridesteady cured my issues. That within itself is enough reason for me to switch.
On top of that, the RS has several design differences that offer (to me) crucial functionality...
-B.N., Houston, Texas, USA