A summary of my experience with Cooma Sport brake pads.
Pink ceramic: They squeal very loudly and started doing so soon after installation, so I got rid of them.
Gold metallic: quieter than the pink ones, they brake well and last a long time. Recently, during a 10-km descent, my brake rotors overheated and they squealed loudly on the way down. After several dozen kilometers, the glazed layer wore off. Often, when I remove the pads, they turn out to be cracked on the side or chipped at the edges—I don’t have anything to compare them to.
Now I’m going to test the silver and regular black ones.