I installed the same springs a few weeks ago and I am disappointed in the results....the rears look like they sag (compared to the front) and the rear will bottom out from time to time (yes, I installed the small bottom out bumper)......but the fronts look like they have not been lowered much if at all. I have looked closely to make sure that the springs are properly in the slots in the LCA's, so that the tip of the spring is in the lower part of the well, and it appears to be fine.
One thing though, I installed the energy supsension isolators on the lower and the upper of the spring and those things are pretty thick on the bottom, so maybe that is something that will settle. I would consider taking them off, but that may just create a squeek, which is about the most infuriating sound coming from a car.
I would have bought the Sportlines, but someone wrote that they had a frequent bottom out problem....so that made me choose the Pro-Kit.
HOWEVER, it does handle 10x better on the turns with the new springs, and that is with Monroe Sensatrac's (lifetime warranty, til I can buy some real springs). My tires stick like glue now, so I am wired to get some real shocks and see how much better it will handle.