Some manufacturers will use stock disc blanks and drill or knee mill (slot) them. These metals are not supposed to be used for those aggressive applications and have a tendancy to crack or break under all the force with a compromised geometry. Basically if they start cutting holes or slots in the thing, you want to make sure they are using strong metals to reinforce the structure to withstand the hard clamping force of the calipers even with material removed.
Also, when you have a two piece rotor, it is just one more part to go wrong. You need to make sure the manufacturer has confronted the issues when you deal with screw on brake centers.
From the manufacturer site, "Alloyed iron formula adds strength and heat resistance. Heat treating further improves rotor performance for a more uniform and stabilized microstructure."
Center rotor hat mounting, "Exclusive full floating design with 10.9 grade alloyed hardware. Hardware is DACRO coated and crimp locking. DACRO is highly corrosion resistant and provides a film for easier movement between the hat and rotor ring as disc expands and contracts and the crimp design provides positive engagement without rattling or torque loss at temperature."
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