While installing the bracket I've encountered a problem. I've been grinding away (thanks hardsteppa for the tip about the carbide burr, I found one in my Dremel kit and it helped a lot), but if you see the yellow circle second picture I've attached, I've actually hit the hole circled in blue in the third picture.
I've probably only cut away about 1mm, but that's all the meat there is before you hit the hole. What's worse is that the caliper STILL doesn't clear the rotor as the rotor continues to scrape slightly in places.
So, before I can even try it on track, I can safely say it's no good for track work as the rotor will expand with heat and eventually grind up against the caliper. I can't cut away any more caliper or I'll just be cutting into the tunnel where the bolt holds the caliper together.
All GKTech needed to do was put the hole 3mm out and it would have been perfect. Now I'm down about 3-4 hours of grinding time, whatever the bracket and grinding tools cost, and have a stuffed caliper.
If I had my time again, I would have wasted my money on something else.