I don't know about discs but I do know that Tarox Fast Road and Track pads are sh*t!
I did one trackday and 1500 miles on a set and there was hardly any pad left on them...and what was there had a huge crack running all the way round the outside.
They need heat to get any kind of bite, but it seems that if you do work them hard to get them hot they just crumble into dust.
Compare that with Ferodo DS2500's, on which I've done 4 trackdays and 18,000 miles - changed them last week and there was 8mm left on each pad.