I like the z23 pads for a street car. Great upgrade from the summer tire pads the car came with because they dont dust or destroy rotors like the stockers did. Initial bite is slightly less but comparable for me in daily driving and back road fun. I kept the stock pads if I ever do a track day though, they may have worn the rotors like crazy in 19k miles of mostly highway driving but there is still a ton of meat left on the pads.
just an FYI,
@vivix explains what they mean by "better" so credit where it's due. for some people, especially those who can't stand brake dust dirtying their wheels, the performance of the OEM Motorcraft BRF1494 does not outweigh the negatives that come with that performance
just so
@EsTea gets a clear answer, many on the best tuners/racers on the Forum agree the Motorcraft BRF1494 (summer OEM) brake pads are dollar-for-dollar some the best pads you can get for the FiestaST. they have amazing stopping power with great initial bite and are a great value. with the huge added bonus of the Ford engineers designing the car using those pads. to get a better quality stopping pad on factory rotors usually means paying more money and/or dealing with a pad that makes horrible noises when used and doesn't work until they heat up.
the trade off is an unholy amount of brake dust created and also eating through rotors. someone else please correct me if i'm wrong but i think the big reason the rotors get chewed through is due to all the heat that builds up and doesn't dissipate fast enough. this is a *good* thing cause it means the brake pads are transferring more of the car's kinetic energy into the rotor. it's a big reason why brake duct cooling is such a big thing here.
i too wanted to go down a whole bunch of different roads to increase stopping power on the Fiesta thinking it's a weak point. it's not. finding a way to manage the rotor heat and changing how you brake to reduce the heat created are the two things i'd recommend now. i don't even think BBK are worth the cost/install trouble unless you really push the car hot lapping.
but for some the tradeoffs of the OEM summer pad aren't worth it and they go for a dust-free setup that gives them enough stopping power for them. something to think about.