I just use the wavemaker function on my RKL with the evo750s. It works fine. They started to start backwards after about 4 months despite their clever design, so I took of the "wing" thing that separates the propellar from the magnetic impellar housing, and that solved the problem (makes the start-backwards failsafe work better because it allows the impellar to lift out of the motor better when the pump starts backwards and the flow goes back into the pump instead of out into the aquarium. As a result the impellar lifts out of the motor, smacks the bumper, and then falls back into the motor to try again. The process repeats freely until it starts forward.)