I had the Porterfield pads installed about a week ago..They are worth every penny as far as I'm concerned..I HATE the dust with a passion.
It would be terrible after 2-3 days of normal driving..I washed mine this morning after 7 days and they were still fairly clean..Most was road film but little brake dust..I'm not sure what the going prices are for the other leading brands but my money is on the Porterfield's..
To be honest, I'd love any pad that saved me as much cleaning time as this one..They are GREAT..