I had the trackbar replaced by JEEP dealer under this star case a few days ago. It make a great difference in the steering. Since I am familiar with the way my jeep runs, I asked a friend , familiar with my jeep if they could feel the difference. They said it is a GREAT improvement.
I am not sure it is 100%, I have not had it on the highway yet, But is no longer wanders.
The way I tested my jeep was I got on a straight road held the steering wheel solid. After a few 100 feet the jeep started to wander to the left ( a good bit) I straightened the car and continued the test. Now the jeep wandered to the other side of the road. After the trackbar fix, my jeep does not wander on the same road to either side, well maybe a little (as expected), but not left then right. There is room for improvement in the steering, But this is a great improvement
P.S. they did not do the alignment even thiugh i asked for it. They said it did not need it for this part replacement (??????) I am not a mechanic so i could not argue fro a point of strength.