oilspot

Bill,

I appreciate your detailed description of controllers.

I opted for an upgraded "inertia type" controller, Tekonsha Prodigy Model.  At about $130 for the box, it is a bit pricey, but is state of the art in inertia sensing.

THere are no pendulums to confuse with hills or angles, the unit is self leveling (between 0 and 70 of horizontal), and has a sensitive accelerometer.  

It is very similar to a proportional unit and you can adjust the proportion with a few buttons and dials.  It also has a handy readout to confirm correct trailer hookup, real-time braking voltage, and digital proportional settings.

I have driven about 500 miles and am quite pleased.   I recommend it to anyone looking for a very good controller.  It is basically a set it and forget it system.