It works pretty well actually. When I first got Mini it wasn't working. Went through the troubleshooting and didn't see any problem so I bought an identical kit to replace the servo thinking the board inside was bad. Nope, wasn't it.
Call their tech support and actually spoke to a real live person, in of all places, the good ole US!
Found out the signal wire (brake ground) had a residual voltage of like 1.5 V. This cruise only works when there is 0V in that ground. You tap brakes, system shuts off.
I ended up using a simple micro switch on the brake lever to give it the proper ground.