specifically, 30mm aluminum and iron. what are the differences that really matter? what justifies my spending $200 extra on the aluminum?

havn't really seen this around lately - thought i'd ask.
thanks

 

Iron versions weigh a ton is one of the main things. I believe Nissan went with iron later because of some aluminum caliper/steel piston compatibility problems but I've never heard anything from any of the Z32 sites I've visited. I would say just change your brake fluid regularly and you will be just fine.

I've held both the iron and aluminum versions. The weight difference is not pretty.

 

so is it worth spending the extra 200 on? i'm sure i will regardless, but...ya know?