We are mudders and have not found any pads that would last.
I don't have them on Amy's pioneer yet. But I have been running them on my RZR. I honestly can't really tell any difference in stopping power but I'm running portals and 35s also so it's kind a hard to stop anyhow. LOL
To begin with they are a little noisy until they get worn in but not too bad. With regular organic pads I would get one good ride,,,maybe. My last set of super ATV pads lasted 3/4 of a ride before I threw a pad. With the sintered metal pads I would get three maybe four rides. With the brass ones, I cannot tell that they are even worn any yet and we have been on probably five or six rides with them.
I'm not saying they are for everyone, but if you are a mudder, you need them.