Well I'm surprised no one's said they've had experience with this controller! It gets a 76% 5 star over on Amazon with 116 reviews, and very good reviews on various towing websites. (FYI - The Tekonsha P3 does better with 89% 5 star with over 1400 reviewers.)
The downsides I've read on this controller are that the display is not always bright enough and running extra cables & holes in your dash to mount the two dash units. Some reviews said they liked it just as well as the P3 in terms of overall braking. Most everyone liked the ability to mount the panic button in a more accessible place. But it doesn't have the nice readout and diagnostics of the P3.
For me, the bottom line would be how well it helps to eliminate the "Hensley bump." A few who have the Hensley hitch have said the P3 does real well with this. (Others with a Hensley hitch claim the P3 is just a sophisticated pendulum controller that will never come close to matching the smoothness of a true proportional control, which is in some way is connected directly to the braking system.)
