It's high quality, easy, fits well in the back of the 2-door. I don't think the JL windows will roll up like my old JK windows. This works well.
It shouldn't make a difference. Did you take the bar off the back window so you can curl the sides of the bag?Might work well on JL, but i used it yesterday for the first time in JLU and i could not get it to fit behind the seat, left it diagonally. Kinda a big let down.