It's good to read different opinions.
I tried on my XC bike the cooma silver (ex-plus compound) and to me they are pure junk; very low friction, basically not braking even after bedding in.
I was induced by their technical explanation with friction factors etc etc; by the way the ex plus should be the best in the range, I imagine the other compounds.
Then I ordered the ZTTO metallic and they are really good; great bite and stropping power, maybe a little squeaky with wet rotor; I was pretty confident as
normally everything from ZTTO is between quite good and very good.