I don't think they crack often, but with any cross-drilled rotor, there is a chance that it will crack. People that experience problems usually complain a lot more too, so it's really hard to judge how often it happens. Changing rotors is really simple too, and like I said, if you do encounter problems down the road, if you get the from RRE they can help you out I believe.

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2004 WRX - WR Blue Pearl
1997 Eclipse GS - Royal Sapphire Pearl