If I'm understanding correctly, the resistive elements within the grips are switched between series and parallel. Not a bad idea. So for example: if your hand grip elements are 8 ohms each, in series they would be 16 ohms and in parallel they would be 4 ohms. Assuming 12.5 volts (battery), you'd consume 9.8 watts in series or 37.5 watts in parallel. Much better than the heated grip manufacturer's recommendation of using a switched series load resistor which would continue to consume power regardless if switch high or low.
However, the stepless design will allow infinite variable controller (independently for each side) using a timer as PWM. Varying the frequency would change the overall power consumed by the heated grips and thus the temperature. In addition, I wanted the controller to reset off if I turn the bike off (or on). Lastly, since motorcycles typically have an inadequate charging system, I wanted the controller to indicate that I'm exceeding the max amp draw. I know a bit excessive, but a cool idea...right?
As for the temperature, if the roads are dry..I'll ride..even down to 20 degrees F. Oh, I also have a full heated jacket liner.