I know this is a popular wheel for 370z owners so thought I'd share this.
Apparently failure wasn't due to a crash. Just normal driving. Car was a BMW. My friend who's a nano engineer speculated, "The wheel could have had a some congregated defects in the lattice structure of the alloy that caused an amplified stress crack that propagated over time. Then if introduced to a large stress, the material defects agglomerate even more leading to crack propagation and subsequent plastic deformation. Very interesting to know the result of forgestar's failure analysis."
imo be careful with your wheel selection. remember the oem 19" ray's are light forged, and safe.