Funny that as I have used them (Black Diamond) on my competition car for about 9 years with NO problems at all.

Don't like ferrodo pads with them tho, as they leave too much copper behind and so fade quicker.

Dont forget Im talking competition use - on a road car they may fair up a bit better.

I now just use bog standard no name ones from my local motorfactors which are about £70 cheaper and last (for me) the same time span.

Pads, I only ever use Mintex since doing back to back trials with about 5 manufacturers in one day.

Funny old world isn't it