It would be nice to compare the rotors side by side with an IR temp gun to check the heat differential in different areas. On this one I would have to lean with Steve again. JHM's look like they have opened up the air gap channels ("to get better airflow") but they are cutting the weight a lot. Less heat sink and less metal support. SHW rotors of the same design as our OEM were used on all of the later Porsche GT3's up until they switched to Carbon Ceramic rotors and I would say Porsche knows Brakes.