I bought these as an upgrade to my stock rotors for my 2014 Mustang GT. I didn't install them for a few months after ordering. After I installed them I experienced a great deal of modulation while braking. Braking was not smooth at all. Because I waited so long to install and did not have any of the original packaging I did not try to return them. I did order different rotors and braking is back to being very smooth.
Redstuff, as advertised so far
I hate brake dust. I have been using OEM brake pads on my E55 in the past. I tried ceramics once, and didn't like it stopping power and changed it back to OEM. This time I try Redstuff, and it has performed as advertised so far. There is no obvious loss of stopping power. I am still waiting to see whether there is less brake dust.