I'll try and explain. The Jordan does not have 4 wires- it receives the brake sense signal via a cable attached to a potentiometer. It is taken directly from the travel on the brake pedal itself. The difference between that and your run of the mill controllers is that it will vary the amperage sent to the trailer brakes based on how hard you push the pedal. The harder you push, the further the cable is drawn and in turn, the more amperage (which equals braking power) is applied. As was said, it is a
true proportional braking system. The other controllers apply an "all or nothing" amperage, based on a predetermined amount that you set. What generally happens is that the controller is set for higher highway speeds, and when the trailer is in slow city traffic, it bucks like a mule becuase too much braking is occuring for such slow speeds.
The Prodigy uses an electronic decellerometer to measure the rate of decelleration and apply variable amperage to the trailer brakes based on computer calculated logic. The Prodigy is a nice unit too, I've tried both and like the Jordan better.
With regard to other trucks all having Drawtite or whatever controllers... ... ... . that's more likly because they have never heard of Jordan, and have gotten used to adjusting their $49 trashy controller. They may not know there is even a better controller out there. Try one and the difference is an unbelieveable night and day.
Go to a TDR meeting and take a look at the brake controllers on trucks there.

Bet you you'll see nothing but Jordan's and Prodigy's.
Kev