Inertia based or time based trailer brake controller?
The first one I had was a Draw-Tite time delay type, and it worked OK. The main thing I didn't like about it was the sensitivity would drift over time - I'd have to keep re-adjusting it. I have a Tekonsha Prodigy now (inertia), and I really like it. No more fiddling with adjustments, and no more grabbing trailer brakes. Very smooth. You just have to be sure that your connections, and grounds are good, because it does checking, and expects everything to be good and secure, or you get error messages on the display.