Yup. Roush/Koni, but I haven't wrung them out, really. Just street driving. My general and basically useless observation (wrt competition) is that they "feel real good." Handling/grip is definitely improved, but that's to be expected when replacing a worn out suspension.
Hub-center to fender arch dropped about 1" in back and 5/8-3/4" in front, but I'm sure my suspension was sagging a bit before. It wasn't even from left to right! Now it is.
Rate-wise, I'd guess the springs are pretty soft--maybe only about 30% stiffer than the stock early-SE springs. (I made some measurements before I installed the springs--the fronts are linear so not too difficult. Rears I'm not sure.)
Since you have/are getting GCs, you have a lot of tuning ability. You can play around with height, and even go with stiffer springs if you get frustrated.
I'd be very interested to see someone measure the angles on this car.
