I have the PacBrake. It was easy to install, did it in the driveway in a few hours. I have the switch on the shifter and the clutch switch installed. I really am impressed with it's performance, does the job and then some. I use mine pretty much full time, in heavy traffic in town running empty/not towing is when I do not use it because of the absence of brake lights to tell my fellow drivers what I am going to do in my driving. I like not having to use the service brakes as much.
I chose the PacBrake for two reasons, it does have more braking power than the Jacobs or Banks AND it does not have to be belt driven. I do not have to have a stock belt just in case something happens, and IF there were a problem with the PacBrake, it would just not work and not affect my trip or travels, I could easily continue on and deal with it at my convenience.
If I were to get a new truck tomorrow, I would install the PacBrake as my first mod. That also means that if I were to purchase another Dodge, it would be my position NOT to have the 'factory brake' as part of the purchase.
I have driven with both brake types towing heavy loads over the same routes, the PacBrake is the only one of the two I would want on my truck.
CD