Ok, fair enough you mentioned about the plastic backings flexing and all that. But... I've heard that with CNC'd backing they can crack your pistons. They can snap the wee bit it clips onto, They do cost more. And what Muel said earlier, with these ones because they are so slim you need to sand down your prongs? I've never tried CNC'd backings before so when I have the money i'm pretty certain after reading these reviews that I will get some Phat pads. But I really hope nothing breaks on my piston! Haha. I'm not really a fan of sanding stuff down either but hey.