That video actually tells me QJ is not worth it.

First, the hardest part about QJ will be to take them down from the wall and maneuver it to the sides of the car.
That could be a PITA in a narrow garage. The video was deceptive since it started with the QJ already aside the car. This negates the floor jack's mobility advantage.

Despite that, the QG owner only saved 2 minutes. In the above scenario, QJ would be slower for me. Even if not, 2 mins. does not seem enough a delta to justify a $1000 outlay.