As I see it, in my opinion, most of the "trucks" made today are for hauling golf clubs, groceries, or potted plants. They have all the visual accessories to make people think they have some awesome vehicle with amazing power and abilities. Like installing a 7-way connector on the rear of the truck and not installing a controller in the dash. That is fscking stupid...
For a couple of impromptu trips, I used one of these inline brake adapters on my old '98 RAM 2500 and surprisingly it worked well. I wouldn't discount this as being just another gimmick device and would use one again if needed. But the difference between it and when I installed the Mopar brake controller... Night and day. Better adjust-ability, better "feel" of the braking, and the manual brake slider...
If you're going to pull a trailer with brakes, install an OEM controller. In the long run, you'll be much happier that you did.