I used the Prodigy P2 brake controller which I liked very much and it worked very well for me.
Then when I got a new 2010 F150 truck it came with it's OEM built-in brake controller. My Ford OEM Brake Controller is tied into the ford computer system which monitors alot of things. One thing it does that I don't like is if your forward speed is less than 10MPH or so the brake pedal action for the brake controlled is not active. In other other words when sitting at a stop sign on a decline your trailer brake action is not functioning unless you hold the manual slide switch on with your hand.
Roy Ken