Not as much stopping power as SM pads and they will overheat and cook your rotors.
Ceramics make less dust and last longer and are easier on your rotors. Perfect for a zippy car or everyday driver thats not real heavy. They tolerate heat, but also make more heat if used on a heavy rig. Ive heard of them turning rotors on motor homes blue.
Semi Metallics are harder on rotors and make lots of dust, but they stop well. They dont tolerate heat as well as ceramic, but they also dont make as much heat if not over loaded/used.
Ceramics also like to be used "warm" like in a rig thats on and off the brakes like a track car or commuter. They dont like to run for 30 miles of cool country towing and then have to be used cold and quickly, as in a panick stop for elk.
Supposedly the Carbon Metallics are supposed to be the best of both worlds. So I decided to try them. They had great reviews and were USA made. Even the box they came in was lined with foam like a box for fine instruments. They are very nice looking, not like parts store cheapies that look like they are stamped out of crap.
Time will tell.
