For my first truck I bought the best brake controller U-Haul offered and HATED it! It had a feature that supposedly activated the brakes gradually but it didn't work. I could watch the reading increase from 1.0 - 1.5 - 2.0 and so on up until it reached the level I had it set at. Unfortunately no braking actually took place until it reached it's maximum and then it came on with a JERK! It wasn't so bad at freeway speeds but at 25mph or below it was a real irritant. I bought the Tekonsha Prodigy for my current truck and LOVE it! It activates so seamlessly you could forget there is even a trailer there. It did surprise me one time, the road I live on is off of a fairly steep hill. As I was approaching my road coming up the hill I applied the brakes and the trailer brakes locked up. I guess the extra slowing power the hill provided tricked the inertial sensor into thinking I was hard on the brakes. Since then I give a little extra space and let the hill slow me without using the brakes.
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