They are no better at breaking than standard pads for twice as much in my opinion. Redstuff is the one to go for, but be warned don't keep em cold.
Redstuff?
The worst pads I've ever tried...I took them out as they were dismal...utterly dismal cold, warm or hot.
BD Predator weren't much better.
I did lots of road and track miles on Greenstuffs with no issues.
But, as has been said...Ferodo DS2500s are in a different league.
Or Mintex M1144/M1155s.
I also have some Mintex Racing F4R Tarmac Rally pads...the pukka competition stuff. If they get wet it takes you a week to clay-bar the crud off the side of the car...and they squeal like a pig..
But you cannot stop facter unless you hit a wall.
Utterly insane.