I bought a 2016 1500 two months ago with the brake controller. Works great and sure beats the ones I used to have mounted in the way under the dash.

In case you are towing something wide, I added this;
For an odd reason, my truck wasn't spec'ed for the tow mirrors. I bought the OEM ones online. They cost more than the option but I needed them and didn't want the cheesy clamp on mirror extenders. Install only took 20-25 minutes per side. Just make sure to research how to install the rivet nuts without a tool.

BTW, brake controllers sure have come a long over the years.
I remember the one my parents had on a '73 Newport. It was under the hood, had two long coil springs that were progressively wound tighter.
To adjust the brake setting, you loosened a wingnut and moved bar that spanned both coil springs. Moving it towards the tighter wound coils (less resistance) gave more braking.