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Correct -- all this device does is insert a diode to stop voltage feedback to the attached lighting circuit -- yet lets the normal brake light signal to operate the brake lights.. a simple 10 amp diode costs less than $5.00 plus a bit of heat shrink tubing and costs about $40.00 less than the redarc device -- it is exactly the same with many other brake controller's that have an override function.
One very important point that has not been mentioned is many installers/DIY fitters have used the Brake Pedal Switch. As the source of the brake signal however on the modern vehicle, this is NOT recommend sourcing the stop lamp signal from the brake pedal switch. Increasingly the brake pedal switches are not 12V, operate other vehicle systems or are controlled by a vehicle ECU.

Sourcing the brake signal at the brake pedal will also only detect braking events when the brake pedal is depressed (and the switch activated) and not brake applications activated by other on-board systems.
 
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