We've experienced similar results as SouthernCyclone and HowellDoug with our AM company cars and employee cars. I gotta say, the SR springs are one of the smoothest lowering springs I've experienced when paired with stock dampeners. I was quiet surprised the first time I drove our 2011 GT with the SR springs!
Handling is much improved over the stock springs, too. I wouldn't say it's as superior as a top notch suspension company like Steeda or Eibach, but they blow the stock springs out of the water!
Hope this feedback helps you out! Let me know if you have any questions or concerns!