I've put almost 5k miles on mine--towing a Jeep Wrangler Unlimited (4 door) behind two different Class A's. I'm generally happy with mine
, though it did take some learning in terms of how to position it so that it wouldn't slip out of place.
I have a rubberized floor mat that has to be removed so that the three feet of the BlueOx brake box can hold more securely. The box slipped out of place twice, triggering it to shut down completely and throw an error message to the receiver in the RV. So I knew something went wrong, but in both cases I was so close to my destination that I just finished the drive.
The BlueOx also must be level or the actuator will kick on for even minor slow downs. I don't like it to apply Toad brakes when I take my foot off the accelerator in the DP, just for harder braking situations, but on my last trip the little red light indicating that it was applying force blinked on more than I would have liked. When I checked the box, it wasn't quite level so I attribute the problem to that.
IF YOU PLAN to tow an elec or hybrid car, you should check with others who do that. It can be tricky given how the brake pedals work in those vehicles. My buddy is towing a Ford Fusion with the BlueOx and it took him quite a bit more time and trials to get it to work properly for him. In addition to the brake sensitivity difference, that car has some automatic battery saving settings that kill power to the "hot" 12v DC plug if it senses continued use. Well... that wasn't apparent until it killed the power after 30 minutes (or so) of driving. Again.. now that he knows that, he ran separate power and he's all set. He seems happy with his BlueOx brake box too.