I had them with standard discs on the vx220 but must admit i didnt have the car much longer after i fitted them so i dont know how long the discs would have lasted for.
but they where the best combo i had tried on the vx,
A few people run them on 172's and they can spark if used on normal discs. They will kill a normal disc quick usually. Have you had a look on their website? I havent heard anyone on here running them.