I had the DD rotors on my E46 330 which had a BBK based on the E46 M3 rotor. Well...those rotors wore out super quick. About 8 days and they were cracked pretty badly. The OEM Euro rotors lasted much longer.
A member here had one crack completely on him.
I love PFC pads...not a fan of the DD rotors though.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red