These brake pads are a legitimate improvement over the stock brake pads on my 2012 Mustang GT. I'd say the improvement is an easy 5-7 feet shorter from 60-0 MPH. However, they are somewhat dusty. I don't think the pads are unbearably dusty nor do I care as much as some people. I clean my car weekly, so it's a small issue to me. I value performance, and these pads deliver.
Improvement over OEM
I replaced my original factory pads with 160K miles on them with these and I chose them mostly out of price and less for performance, and it claimed to be quiet. They are quiet and very easy to modulate with excellent feel all the way to the limit. I was pleasantly surprised. I have driven about 300 miles and they are quiet if a bit dirty but still very liveable for daily commuters. A definite worthy upgrade from the OEM pads.