The forumla brakes work and they do stop the bike. But it is the pad life that sucks. Also the stopping power is just stronger with 65 dirt bike based brakes. My friend has the same set-up as mx527 and his rear he has no problems. It is the front in which he goes through pads quickly and the pads wear unevenly. He can't even put in two new pads otherwise it will bind on the rotor. He has to run one used pad and one new pad.
I can see where you are coming from on the pad life, mine go fast as well!! But other than that, I love them, I would be worried that with anything more, they would be too touchy.