I bought the Amazon knock off version of this and one thing I can add is to make sure the two bars are dead even with each other when tightening the wing nuts. If I take my tool and just tighten the wing nuts without taking the time to really dial it in, one side will be 1/16" higher than the other and the flare will be garbage. Sometimes I have to reset it and try it 3 or 4 times before I'm able to get the bars at equal height.
Curious to see how it goes once I get the lines on the car. I'm not very confident that my lines are going to be leak free.