I doubt you'll find anyone here with these fitted to their Crossfire. I know people who have used these in the past and they say the things work reasonably well. I've also seen them fitted to various cars and it makes your car look like it has front drum brakes. Maybe an issue, maybe not.

I know this isn't really what you're looking for, but upgrading to either Rotex Gold or Posi-Quiet Ceramics is fairly cheap and very easy to do. I have the Posi-Quiets on my car and brake dust is probably 99% gone, even on track days. It really is the better solution, regardless if on a Crossfire or a Kia.