[Gabriel]

You can test this yourself fairly easily (although following the steps below might classify as a Very Bad Idea). First, put the motor in a clamp or find some other way to prevent it from jumping suddenly. Use clip leads to wire a drill motor to a speed controller (make sure the fan leads on the Victor are wired to the input terminals or to a variable power supply and be very careful to avoid shorts), use clip leads to wire the speed controller to the Maxi fuse block and then to the battery. Obviously you want to use proper wire gages, but for a very short test at no load clip leads should be okay (if they're not, you'll know pretty quickly). Attach the PWM cable to PWM-1 on the controller and slowly pull the joysytick forward, and then in reverse. You'll notice immediately that one direction is definitely faster. Since the leads on the drill don't appear to be marked, it is possible that you will wire them backwards and reverse will be faster, in this case just swap the +V and GND wires on the output terminals of the speed controller.