Anyone Else Have Problems With Ssbc Brakes?

[Merc Dr.]

I've put 20k miles on my SSBC brakes in 2 years. This spring I had a vibration. Turned out to be a warped FRONT rotor. When I had the rotor machined they said the inner side of the rotor was worn to the point there was a lip around the edge. This was about 2 months ago. Friday I noticed a grinding noise/ vibration. I took off the REAR rotors and the inner pads were worn down to nothing and had completely wore out the inner side of the rotor to the point that the vents were almost nonexistant. If this had happened on one rotor I would chalk it up to a stuck caliper, but now it is all 4 that have had some sort of excessive wear on the inner side. Has anyone else had a problem like this? I'm really pissed that I spent $475 on a brake kit that lasted all of 20k miles. I could of cheap brakes that would have lasted at least 60k.